Gary M. Birk, P.E. (NC, VA, & FL)

Gary Birk is a Founder and Managing Partner of Tersus Environmental, LLC, based in North Carolina. He is a Professional Engineer registered in North Carolina, Virginia, and Florida and holds a bachelor’s degree in chemical engineering from North Carolina State University.

With over 40 years of experience, Gary has led the development and application of innovative in situ technologies for remediating contaminated soil and groundwater at sites across North America, South America, Europe, Asia, and Africa. He focuses on sustainable, green approaches to groundwater and soil restoration, with particular emphasis on bioremediation.

In 2011, Gary commercialized EDS-ER™, the first widely used water‑mixable, vegetable‑oil‑based organic substrate designed to provide a lasting source of carbon and hydrogen for enhanced reductive dechlorination and other bioremediation processes. He has developed design tools for in situ bioremediation that have advanced industry practice for estimating substrate application rates. Gary is also a co‑inventor on seven U.S. patents related to the remediation of soil and groundwater.