About Us

A multi-disciplined project management & engineering services firm providing professional services to an extensive portfolio of customers throughout numerous industries. We seek to build long-term customer relationships by listening to our clients, leveraging our experience and delivering on our commitments.


Hunt, Guillot & Associates, LLC was founded in Ruston, Louisiana, by a couple of locals with a passion for both engineering and the wood / lumber industry. At that time, Ruston was only known for its famous peaches and purple-eyed peas. Since opening its doors in 1997, Trott Hunt, Jay Guillot, and Don Plummer have grown HGA into a multi-discipline engineering and project management firm with a staff of over 400 employees.

HGA is organized into business units based on the services provided: Engineering, Pipeline Services, Program Management, EPC Services, and Staffing. We supply services to clients in the oil & gas, refining, chemicals, pulp/paper and wood products, biomass, power, and public works industries.

Over the years, HGA has grown from a single trailer to thirteen locations throughout Louisiana, Texas, Alabama, and New York. Providing services in over 30 states, Canada, and Mexico, we are acknowledged as an innovative leader in the project management and engineering community. HGA has been recognized in the past years by Zweig White, ENR, and Inc. 500|5000 - just to name a few, for its construction management, detailed engineering, and program management services.

Values & Ethics

Remaining true to our original vision, the HGA business philosophy is based on a passion to help clients succeed, to be part of their long-term team, and to share in their success. This philosophy led to the development of the HGA Core Values of: Customer Service, Professional Excellence, Teamwork, Trust, Safety, and Cost Effectiveness. (PDF) 

Client satisfaction is our top priority. We strive to perform above our client expectations, and to deliver all projects on schedule and on budget. Clients come to HGA for our engineering expertise, proven project management processes and reporting, responsiveness, and cost effectiveness – and return to HGA for the same reasons.  

Our Leadership

The HGA Core Values are the foundation of all of our engineering and program management projects. At HGA, we believe in leading by example, maintaining an open and honest dialogue, and honoring all client commitments. Simply stated, we are your valued and trusted advocate through our planned vision and highly collaborative implementation processes.

Delivering on Commitments. Building Long Term Relationships.