With the average engineer retention of almost 20 years, HGA prides itself in providing expertise and knowledge to handle any project. We continually invest in our employees by ensuring our engineers continue their development through continuing education, seminars and lunch and learns. Sixteen of our 19 engineers are registered Professional Engineers, 3 are registered Structural Engineers and 2 are LEED certified.


Randall (Randy) W. Gipson, P.E.
Randall (Randy) W. Gipson, P.E.Principal - Structural Department

BSCE / 1982 Civil – Auburn University
MSSE / 1984 Stuctural – Auburn University

With more than 35 years of structural engineering and management experience, Randy has the deep experience and knowledge from working with literally hundreds of clients across virtually every industry segment.  As a principal and managing partner of HGA, he brings that expertise, experience and oversight to the broad spectrum of new and long-time customers on a the wide range of projects – from the straightforward to the complex.

After joining Guillebeau Britt & Haines in 1984, Randy assumed the role of leading the Atlanta office’s structural engineering department in 1991. In 1994, with the retirement of founding partner Otis Guillebeau and departure longtime partner Ed Britt, the firm transitioned to the current company name, Haines, Gipson & Associates and Randy became President.

Randy’s career has emphasized the same principles he grew up with – integrity and fairness; work you’re proud to put your name on; keeping your word and commitments; and satisfying a personal level of conscientiousness and responsibility uncommon in today’s environment.

HGA also reflects Randy’s philosophy in delivering quality, based on sound engineering principles, for every client; in remaining current through continued training and learning; and in providing an uncompromising level of service.   HGA’s innate ability to view a project through the client’s eyes including critical milestones and construction budgets, has enabled the firm to maintain long-term client relationships, a reputation for reliability, and to expand its customer base to include new industry segments.

Randy is married and has two children. Besides being with his family, he enjoys golf, running, weightlifting and reading.

Alabama, Arizona, California, Florida, Georgia, Illinois, Iowa, Indiana, Kansas, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oregon, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Washington, West Virginia, Wyoming

Structural Engineering Certification Board (SECB)
American Society of Civil Engineers (ASCE)
American Concrete Institute (ACI)
Consulting Engineers Council (CEC)
Structural Engineers Association of Georgia (SEAOG)
Council of American Structural Engineers (CASEG)
Southern Building Code Congress International (SBCCI)
Precast / Prestressed Concrete Institute (PCI)
American Assoc. State Highway & Transport Officials (AASHTO)

R. Clay Lewis, P.E.
R. Clay Lewis, P.E.Principal - Civil Department

BSCE / 1987–The Citadel


A native of South Carolina, Clay joined Guillebeau Britt & Haines in 1987 in its Greenville, SC office.  He relocated to the Atlanta office in 1988, continuing to work in the Civil Engineering Department and in 1993, after receiving his Georgia Professional Engineers license, was named an associate and became lead on myriad state and local road, bridge, and airport projects.  In 1996, Clay was named a principal in the company and assumed the lead of HGA’s Civil Engineering Department.

Clay’s career at HGA exemplifies the principle that service supported by solid, proven engineering principles and tactics is the key to success.  One of his operating principles is “listen to your client and build a solid relationship based on mutual trust and open communication, but never at the expense of your integrity.”

Through the years, Clay has successfully demonstrated these principles and his skills with premier development companies such as Trammel Crow and Fuqua Development to reputable national retails including CarMax and Office Depot.

Clay is married and has two children and besides enjoying time with them, he plays golf, hunts, shoots and dedicates time to his church and its activities.

Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, Wisconsin

American Society of Civil Engineers (ASCE)
Consulting Engineers Council (CEC)
Association of Citadel Men
National Council of Examiners for Engineering & Surveying (NCEE)

David H. Lovvorn, P.E., LEED AP
David H. Lovvorn, P.E., LEED APPrincipal - Structural Department

BSCE / 2002 – Georgia Institute of Technology

David has been with HGA since graduating in 2002 bringing valuable training and experience to HGA’s structural engineering design for both new construction and renovation.  His skill and expertise across all types and aspects of projects make him an invaluable contributor on virtually any project.  David’s past experience with light gauge steel design and construction has added value to HGA in this area. He is particularly advanced in LEED-qualified construction and is at the forefront of HGA’s green design implementations.

Highlights of David’s long-list if structural engineering and project management experience includes:

  • CarMax (Largest used-car dealership in US) Multiple locations in U.S.
  • Eagle Rock Studios Atlanta, Norcross, GA
  • OFS UTD4 (Manufacturing Tower), Norcross, GA
  • Universal Alloy Expansion, Canton, GA and Ballground, GA
  • Marriott’s Meadowview Executive Conference Center (Parking facilities) Kingsport, TN

In his free time, David works on his golf game, is an avid reader and enjoys spending time with wife and children.

Georgia, California

Jeffrey L. Vandiver, P.E., S.E.
Jeffrey L. Vandiver, P.E., S.E.Principal - Structural Department

BSCET / 2003 – Southern Polytechnic State University

Jeff joined the HGA structural department in 2003.  During his tenure with HGA, Jeff has served as a project manager in various markets nationwide including Bridge, Industrial, Commercial/Mixed Use, Renovation, Historic Preservation, Grocery, and Education.  As one of the lead bridge engineers with HGA, Jeff is well versed in Georgia DOT bridge policy and design programs.  Jeff is also manages implementation of the bridge design and drafting software, such as LEAP Bridge and Microstation.

Some of the projects under Jeff’s management include:

  • Clermont Hotel Renovation / Historic Preservation – Atlanta, GA
  • Harbins Rd Bridge over SR-316 – Gwinnett County, GA
  • Sugarloaf Parkway Bridge over SR-316 – Gwinnett County, GA
  • FedEx Ground HUB Expansion – Toledo, OH
  • FedEx Ground Automated Regional Distribution Center – Zelienople, PA
  • FedEx Ground Distribution Center Expansion – Green Bay, WI
  • FedEx Ground Distribution Center Expansion – North Canton, OH
  • FedEx Ground Distribution Center Expansion – Syracuse, NY
  • CSX Bridgeworks Steel Fabrication Shop Expansion – Barboursville, WV
  • Kemah Marketplace – Kemah, TX
  • Tamiami Crossing – Tamiami, FL
  • The Fresh Market Prototype Development
  • Paulding County High School Theatre and Gymnasium Addition – Dallas, GA
  • East Paulding County High School Theater and Gymnasium Addition – Dallas, GA
  • Hiram High School Theater and Gymnasium Addition – Hiram, GA

Outside of work, Jeff enjoys family time, golf, running, and hiking.

Georgia, California

American Society of Civil Engineers (ASCE)
American Institute of Steel Construction (AISC)
American Concrete Institute (ACI)

Daniel (Danny) D. Campbell, P.E.
Daniel (Danny) D. Campbell, P.E.Principal and Vice President - Structural Department

BSCET / 1986 – Southern Polytechnic State University


Danny joined Guillebeau Britt & Haines in 1986 in the structural department, becoming an associate in 1995 and being named principal of the HGA structural engineering department in 1996.

Danny epitomizes the values of HGA – top-quality, reliable and responsible work based on proven engineering principles; superior client service; viewing projects from the clients’ perspective; meeting commitments and timeframes; and operating with honesty, taking responsibility and integrity.

In his more than 30 years at the firm, Danny has demonstrated the broad depth of skills required to lead projects across diverse industries from transportation to education to manufacturing.  He has been instrumental in expanding the customer base by developing new long-term relationships with various local and state governmental agencies, aviation and heavy industrial manufacturing clients. A sample of project types completed under his supervision include:

  • Lan Chile Air Cargo Facility – Miami International Airport, FL
  • Law Enforcement Center – Whitfield County, GA
  • Gobain Desjonqueres Glass Bottle Manufacturing Facility – Covington, GA
  • Air Cargo facility – John F. Kennedy International Airport, New York, NY
  • Yamaha Golf Cart Manufacturing Facility – Newnan, GA
  • Dunlap Hall Addition – North Georgia University, Dahlonega, GA
  • Multiple Bridge projects, private and governmental, GA
  • GNB Battery Reclamation Facility – Columbus, GA

Danny is married and has 3 children and 5 grandchildren. Besides time with them, he enjoys working out and weight lifting.  He is also a volunteer firefighter.

Alabama, Arkansas, California, Delaware, District of Columbia, Georgia, Maine, Montana, New Hampshire, New York, Oklahoma, Vermont, Virginia

Structural Engineering Certification Board (SECB)
American Society of Civil Engineers (ASCE)
American Institute of Steel Construction (AISC)
National Council of Examiners for Engineering and Surveying (NCEES)

Robert (Bob) A. McCann, P.E.
Robert (Bob) A. McCann, P.E.Principal - Civil Department

BSCE /1989 – United States Military Academy, West Point, NY
Armor Officer Basic Course, Fort Knox, KY


Bob combines his 20+ years of civil engineering and management knowledge with an additional 5 years of relevant military experience to bring a broad and client-focused background to commercial, retail, industrial, residential and educational projects.

A graduate of the U.S. Military Academy at West Point and a veteran of Desert Shield (Iraq, Saudi Arabia), Desert Storm (Iraq, Kuwait) and Operation Restore Hope (Somalia), Bob joined HGA in August 1994 as a project engineer before becoming a principal of the firm in 2012.

Bob’s experience includes work on multi-use developments, multi-unit residential, academic, retail and commercial projects including:

  • Barrow Crossing (60-acre commercial development) Winder, GA
  • The Promenade (73-acre retail and restaurant development) D’Iberville, GA
  • Georgia 400 University (joint campus for North Georgia University (Dahlonega) and Gainesville State University
  • Coleman Market Place(60-acre commercial development) Danville, GA
  • North Georgia University (student and cadet residential halls, dining hall, and convocation center) Dahlonega, GA
  • Oxford Exchange (80+ acres infrastructure, commercial and restaurant) Oxford, AL
  • Buford High School (59 acre new high school campus) Buford, GA

Bob honorably completed his Army career as a Captain and brought his leadership skills, ability to work with people, attention to detail, solution-focused mindset and discipline to his position at HGA.  His civil engineering skills are as varied and proven as they are deep and include everything from project management and design to site layout and utility routing.

A native of Pennsylvania, Bob is married and has 2 children. Besides family and football, Bob also enjoys baseball, golf, everything involving the Pittsburgh Steelers and beating Navy in any sport

Georgia, Pennsylvania, Louisiana


C. Stoney Abercrombie, P.E.
C. Stoney Abercrombie, P.E.Associate – Civil Department

BSCET / 1996 – Southern Polytechnic State University

Stoney joined HGA in 1996 and in 20+ years with the firm has been project manager for diverse and multiple retail and educational civil engineering projects throughout the Southeast, including having designed over 5-million square feet of mixed-used developments.  His roles have included design and management of everything from site layout, erosion and sedimentation, road design, and storm water management.  Some of the highlight projects he and his team have worked on include:

  • Overland Pointe Market Place and Auto Mall(150+ acre retail and restaurant development) Overland Park, KS
  • Henry Town Center Phase I and II(60-acre commercial development) McDonough, GA
  • Kennesaw Marketplace (50+ acre commercial, retail, restaurant and residential complex) Kennesaw, GA
  • CummingTown Center (60-acre mixed-use development) Cumming, GA
  • Lindbergh Plaza (Rebuild of 26-acre, 400,000 sq. ft. intown shopping center) Atlanta, GA
  • Southern Polytechnic State University (600-bed dormitory and dining hall) Marietta, GA

Stoney is an avid sports fan and participant and particularly enjoys hunting, fishing, camping, softball and golf.  He is married and has a son and two daughters.


M. Bruce Baker, P.E., S.E.
M. Bruce Baker, P.E., S.E.Associate - Structural Department

BSCE / 2006 – Auburn University

Bruce joined HGA’s Structural Engineering Department in 2006, bringing significant on-the-job training in the construction field to complement his educational training.

During his tenure at HGA, Bruce has worked on a broad scope of projects including retail centers, schools, church additions, industrial facilities & warehouses, community centers, mausoleums as well as being a part of the CarMax project team that has built stores across the U.S.

A sampling of the projects Bruce has worked on include:

  • Buford Community Center
  • Braselton 1M sq. ft spec building
  • Locust Grove 1M sq. ft spec building
  • ZF Industries Wind Energy Manufacturing Facility
  • Caterpillar Manufacturing & Distribution Facility
  • Halstead Global Warehouse

Bruce is also one of the HG pioneers on Revit 3D® modeling and besides training team members on the program, stays updated on it and related technology.

Outside of HGA, Bruce likes to be with his family and enjoys exercising, listening to music of all types and reading.

American Society of Civil Engineers (ASCE)
American Concrete Institute (ACI)

David R. Connor, P.E., S.E.
David R. Connor, P.E., S.E. Associate - Structural Department

BSCE – Georgia Tech, 1997
MSCE – University of South Carolina, 2009

David rejoined HGA in 2014 after having worked at the firm from 1997-2008.  He has been a project manager on a variety of projects including retail, industrial, institutional, and transportation/bridges. He has performed structural engineering at locations across the U.S. including areas of high-seismic activity and wind loads. He has experience in all aspects required for project completion including fee and cost estimations, structural design and detailing, drafting, project coordination across disciplines, and construction administration.

For each project he works on, David strives to provide effective, safe designs based on proven engineering methods, within the prescribed budget, and with minimal field issues during construction. He attained his PE license in Georgia in 2002 and most recently augmented his experience and education by passing the 16-hour NCEES Structural Engineering exam.  David also wrote and developed a study guide to help structural engineers prepare for specific exams.

Some HGA projects of note under David’s supervision:

  • Michelin Project Azalea (Largest tire distribution center in the U.S.), Spartanburg, SC
  • GTC Riverwatch Cinemas (12-screen movie theatre), Augusta, GA
  • Southchase Industrial Park (200,000+ sq. ft. warehouse), Greenville, SC
  • Shops at Tamiami Crossing (Retail shopping center), Naples, FL
  • CarMax (Largest used-car dealership in US), Locations across U.S.

David’s outside-of-work interests include cycling, craft beer, and spending time with his wife Amy and dog Elliot.

Georgia, South Carolina, North Carolina, Florida, Alabama, Mississippi, Tennessee, Oklahoma, Indiana, New York, Delaware, Illinois (SE), NCEES Record

American Institute of Steel Construction (AISC)
National Council of Structural Engineers Associations (NCSEA)
National Council of Examiners for Engineering and Surveying (NCEES)

David A. Domyslawski, P.E.
David A. Domyslawski, P.E.Associate - Structural Department

BSCE / 1998 – The Georgia Institute of Technology

David has been with HGA on the structural side of the business for more than 20 years, becoming an associate in 2004.  His expertise across widely different projects, materials and roles reflect his attitude of “whatever it takes to get it done right.”

Over the years as project manager, David has overseen design, execution and completion of projects ranging from industrial, commercial, institutional, recreational, educational and transportation. Some of the projects that reflect his unique approach include:

  • Abercorn Commons (180,000 sq foot retail center and the first LEED all-retail project in the United States), Savannah, GA
  • Piedmont (GA) College (Baseball stadium and performing arts center), Demorest, GA
  • District at Howell Mill (First Wal-Mart in the city of Atlanta), GA
  • The Prado (Redevelopment of 300,000+ sq. ft. longtime landmark and destination shopping center), Atlanta, GA
  • Gwinnett County Police Precinct and Snellville Police Headquarters, Snellville, GA
  • Floor & Décor (1,440,000 sq.ft Headquarters and Warehouse), Savannah, GA
  • Tory Burch – distribution center (750,000 sq. ft.), McDonough, GA

David likes spending his free time with his family and working with young people at his church.  He also enjoys hunting, fishing and working out, with cross training being his regimen of choice.


American Society of Civil Engineers (ASCE)
Society of American Military Engineers (SAME)

T. Luke Ferguson, P.E.
T. Luke Ferguson, P.E.Associate - Civil Department

BS / 2006 Biosystems Engineering – Auburn University

Luke has been in the Civil Engineering Department at HGA since joining the company in 2006. Over the years, Luke has served as the project manager for multiple commercial, municipal, and retail projects with responsibilities that include site layout, utility routing, grading, storm and sanitary sewer layout and design, erosion and sedimentation control, hydrology studies and report production, storm water management facility design, road design, project management, permitting, and drafting/design using AutoCAD Civil 3D.

Luke has spearheaded the effort to develop and maintain HGA’s drafting standards for AutoCAD Civil 3D, ensuring the firm’s quality and turnaround is ahead of its competitors. He also is instrumental in the research and deployment of advanced methods and technologies that enhance HGA’s civil engineering designs, maximizing productivity and helping deliver solutions that surpass the clients’ expectations.

Some of Luke’s design/project management experience includes:

  • Peachtree Corners Town Center (22-acre mixed-use development), Peachtree Corners, GA
  • Loganville Elementary & Middle School Campus (50-acre municipal development), Loganville, GA
  • Legacy Park – Primerica (95-acre office development), Duluth, GA
  • Dawson Marketplace (95-acre retail development), Dawson County, GA
  • Clermont Hotel (1.2-acre re-development), Atlanta, GA

Luke is married and has 3 children.  In addition to spending time with his family, Luke also enjoys being outdoors, hunting, fishing and playing golf.  He’s also a self-proclaimed technology geek.


American Society of Civil Engineers (ASCE)
Autodesk Beta
Autodesk Users Group International

Glenn A. Graham, P.E.
Glenn A. Graham, P.E.Associate - Structural Department

BSCE / 1994 – University of South Florida

A key member of HGA’s structural department since 1996, Glenn brings experienced project management insights and practice to the design and oversight of transportation, education, commercial/mixed use, office, government and worship developments and facilities.  Glenn is instrumental in mentoring new employees and his guidance has helped speed up the learning curve for many new engineers.  In addition to his engineering responsibilities, Glenn is the chief IT liaison for the structural department.

Some of Glenn’s notable projects include:

  • Satellite Boulevard Extension and Bridge, Duluth, GA
  • Rabun Gap Nacoochee Preparatory School, Arts & Technology building, Rabun, GA
  • Home Depot Expo Design Centers, Atlanta (GA) and Orlando, FL
  • Westminster Junior High School, Atlanta, GA
  • Yellow River Water Reclamation Facility, Atlanta, GA
  • Jackson First Baptist Church Family Life Center, Jackson, Ga
  • University of Georgia Food Product Innovation and Commercialization Building, Griffin, GA
  • Roswell Fire Station #4, Roswell, GA
  • Buford City Schools Multipurpose Facility, Buford, GA
  • Oechsler Speed Factory, Acworth, GA
  • The Walker School Warren Science & Technology Building, Marietta, GA
  • Buford High School Athletic Building, Buford, GA
  • Buford High School Performing Arts Building, Buford, GA

Glenn enjoys sports and other activities with his family as well as running and hiking.


American Institute of Steel Construction, Inc. (AISC)

Joseph C. McCown, P.E., LEED AP
Joseph C. McCown, P.E., LEED APAssociate - Civil Department

BSCE / 2005 – Auburn University

Joseph has been with HGA since 2005.  He has served as a designer and project manager for large- and small-scale commercial, office, warehouse, and municipal civil engineering projects.  His core responsibilities include pre-design planning, design and production of plans and specifications, permitting, construction administration, and inspections.

Joseph has taken a leadership role for the firm in the implementation of Leadership in Energy and Environmental Design (LEED), emphasizing strategies to provide energy-efficient designs and improve a development’s lifetime performance by applying his knowledge of green designs.

Some of Joseph’s more notable projects include:

  • Epps Bridge Centre(68-acre, 400,000 sq. ft. retail development), Athens GA Oconee County.
  • North Logan Crossing (40-acre commercial development), Loganville, GA
  • The Promenade (73-acre retail and restaurant development), D’Iberville, MS
  • Coleman Market Place(60-acre commercial complex), Danville, VA
  • Oxford Exchange(80+ acre commercial, office, retail and restaurant project), Oxford, AL

Joseph enjoys being with his family, likes traveling, music, sports and reading.

Professional Engineer – Georgia
LEED Accredited Professional


American Society of Civil Engineers (ASCE)

Scott E. Samuel, P.E.
Scott E. Samuel, P.E.Associate - Civil Department

BSCE / 1996 – University of Tennessee

Scott came to HGA January 1998 after spending one year of post-graduate work with the former Ogden Environmental and Energy Services (now part of AMEC Foster Wheeler) in Oak Ridge, TN.

Scott’s training and experience has made him a turnkey resource for HGA civil engineering initiatives. During his 20+ years with the firm he has led design and engineering teams that have worked on commercial, residential, multi-use, educational, sports and retail projects across the Southeastern U.S. Additionally, Scott is responsible for in-house IT management and maintenance for the Civil Department.

Some of the projects include:

  • Perimeter Place (40-acre multi-use development), Dunwoody, GA
  • University Commons (Publix/Walmart anchored, multi-level retail over parking), Knoxville, TN
  • Henry Town Center(60-acre commercial complex), McDonough, GA
  • McDonough Marketplace [Walmart and Lowe’s anchored], McDonough, GA
  • Princeton Lakes / Camp Creek II(140+ acres of infrastructure, commercial and multi-family residential), Atlanta, GA
  • Target multi-level retail, Homewood, AL
  • Victory Square Target Re-development(35-acre commercial re-development), Savannah, GA
  • Greater Atlanta Christian School (Field house and renovations to baseball stadium, gym and Learners Hall), Atlanta, GA
  • Aldi grocery stores (Multiple sites throughout GA, SC and TN)
  • Home Depot (retail store and shops), Fort Oglethorpe, GA
  • Renovation/Redevelopment of Toco Hills, Andrews Square and Fountain Oaks, Dekalb Co./Atlanta, GA
  • Six Flags over Georgia (Superman Coaster and Go Kart track), Austell, GA
  • Waterford on Piedmont(High-rise condominium tower), Atlanta, GA
  • Moores Mill Re-development (Publix anchored and mixed use), Atlanta, GA

Besides his family, Scott enjoys off-road motorcycling, skiing, golf and fishing.

Professional Engineer in Georgia and Tennessee
Level II Erosion Control Certification in Georgia and Tennessee

Kevin Southerland, P.E.
Kevin Southerland, P.E.Associate – Structural Department
BSCET / 1999 – Southern Polytechnic State University

A native of Dalton, GA, Kevin has been with HGA since 2000 and brings strong and diverse structural engineering and project management experience that he’s developed from working on more than 100 major commercial, retail, utility/infrastructure, municipal and industrial assignments.  His responsibilities include design and detailing, project management, drafting and project coordination. Some of his design/project management experience includes:

  • CarMax (Largest used-car dealership in US) with now over 100 new locations in U.S.
  • Queen of Heaven Cemetery (Mausoleum), Fort Lauderdale, FL
  • Suburban Plaza (Façade Renovation) Decatur, GA

Kevin is a college football fanatic and enjoys spending time with his wife and 2 children.


American Institute of Steel Construction (AISC)
American Society of Civil Engineers (ASCE)

 Stephen J. Sywy, P.E.
Stephen J. Sywy, P.E.Associate - Structural Department

BSCE – Clemson University, 1991

Steve has been employed with HGA since 1994. Steve has served as a project manager for commercial, industrial, educational, and other various project types. His responsibilities include project fee estimation, structural design, detailing, drafting, and project coordination. Steve’s greatest asset is his ability to provide practical solutions to design and construction field problems. Pulling from his vast experience, Steve is able to spot problem areas in design and address the issues before they become bigger fires as well as provide timely, efficient, and economical solutions to field issues. Some projects of note under Steve’s supervision are King’s Hawaiian Manufacturing Facility, Buford High School Classroom Building, McDonough Middle & High School, Loganville Elementary and Middle School, Savannah Christian Church and Hall County Courthouse.

In his spare time, Steve enjoys fishing, skiing, tennis, golf, watching college football and taking family trips. His married and has two sons.


American Institute of Steel Construction (AISC)
American Society of Civil Engineers (ASCE)


W. Todd Daprano, E.I.T.
W. Todd Daprano, E.I.T.Project Manager - Structural Department

BSCE / 2004 Georgia Institute of Technology

Todd joined HGA’s structural engineering department in 2004. Todd has served as project manager with a focus on both new construction and renovation projects.  Todd has designed and managed a diverse assortment of projects including but not limited to commercial/mixed use developments, light and heavy industrial projects, bridge, governmental, office, and renovation of existing structures.  His responsibilities include structural design, project management/coordination, detailing, and drafting.

Some of Todd’s notable projects include:

  • Apple Valley Spec Warehouses
  • Voestalpine Automotive Components Plant Expansion
  • Decatur Crossing Retail Development
  • Inspiration Slope Mausoleum – Green Hills Memorial Park, Rancho Palos Verdes, CA

Todd enjoys spending time with the family and being outdoors as much as possible.

American Society of Civil Engineers (ASCE)
American Institute of Steel Construction (AISC)

David Grant, E.I.T.
David Grant, E.I.T.Project Manager - Structural Department

BSCE / 2007 – Southern Polytechnic State University

David has been employed with HGA since 2014 and has more than a decade of structural engineering experience with particular expertise in the design of low-rise buildings such as education, government, religious, warehouses, and office/retail spaces. He has experience detailing and designing construction materials such as structural steel, reinforced concrete, masonry, cold-formed steel, and wood.

Some of the projects he has managed at HGA include:

  • Manufacturing Resources International (Operations center refurbishing and renovations), Alpharetta, GA
  • Shoppes at Mid Rivers (Retail center), St. Peters, MO
  • Academy of Scholars School (Building addition) Decatur, GA
  • Alpharetta Public Safety (Building addition), Alpharetta, GA
  • Suburban Plaza (Redevelopment of 290,000 sq. ft. landmark shopping center), Decatur, GA

In his leisure time, David likes spending time with his family, is a passionate football fan, plays golf and enjoys being outdoors, hunting and fishing.

American Society of Civil Engineers (ASCE)
American Institute of Steel Construction (AISC)

Cody D. Gulledge, E.I.T.
Cody D. Gulledge, E.I.T.Project Manager - Civil Department

BS / 2006 Biosystems Engineering – Auburn University
BS – Biosystems Engineering, Ecological Engineering Option / 2017 Auburn University

Cody is the newest addition to the HGA family, joining the Civil Department in 2017 and serves as a Project Manager for large industrial sites.  His responsibilities include site layout, grading, utility layout, stormwater hydrology studies, and erosion control plan production.

Significant Projects:

  • Camp Creek Business Center: Site V, W, and X

In his spare time, Cody enjoys hiking with his dog, kayaking, golf, watching Auburn sports, and reading.


Debbie Kolhagen
Debbie KolhagenFinancial Controller

Delta College of Arts and Technology, Saginaw, MI

Debbie came on board with HGA in 2002 and is the finance chief of the firm overseeing and doing all fiscal aspects of it, whether it is accounting, voucher and expense processing, accounts payable, vendor compliances, P&L, etc.

In addition, she is the human resources lead and benefits manager, responsible for reviewing 401k plans, options and compliance of them; and reviewing and overseeing the healthcare and other insurance benefits at HGA.

Debbie is a blessed mother of two children and spends much of her free time with her family and friends.  She also enjoys cooking, entertaining and is a Pampered Chef enthusiast.

Mandy Smith
Mandy SmithSecretary - Office Manager

Bachelor’s Degree – Criminal Justice / 2007 – Gwinnett Technical College

Mandy is the voice and face of Haines, Gipson & Associates and has been for nearly 20 years.  It’s her calm voice and steady handling of communications for HGA that includes online, in-person and over the phone.

As the office manager, she coordinates and oversees virtually every aspect of an office of nearly 20 engineering professionals that includes maintaining schedules, arranging meetings, managing office equipment and supplies, preparing documents and proposals and is the shipping and receiving department for the firm.

In addition, she is responsible for ensuring professional registrations are current and scheduling professional development courses and credits for the staff.  Mandy is the smooth operator at HGA and sets the standard for keeping the operations running effectively.

Mandy is married and is the proud mother of three children and one grandson. Mandy enjoys spending time with them and attending their activities including gymnastics and baseball. She is also a committed concert-goer and a rabid Florida Gators football fan.