Don Clark, P.E., Terracon

    TEMPE, ARIZ. (Sept. 22, 2022) – Engineering consulting firm Terracon is proud to announce that Donald R. Clark P.E., a Senior Principal and Senior Consultant in the Phoenix office, is celebrating his 30th anniversary with the company and 50 years as a consultant.

Clark established Terracon’s Denver and Phoenix offices and has made a lasting impact on the company. He has also mentored many Terracon employees over the years both in Arizona and across the country.

His dedication and effort to Terracon has allowed not only the company to thrive, but the employees as well.

“Don Clark is not only one of the best geotechnical engineers in Terracon, but he is also one of the best and most well-respected geotechnical engineers in the country,” said Brent M. Borchers, Arizona Regional Manager for Terracon. “Don enjoys working with and is a great mentor to many young engineers throughout the company. Terracon is lucky to have such an amazing leader in our ranks and would not be the same without him.”

Terracon is an employee-owned multidiscipline consulting firm comprised of more than 5,000 curious minds focused on solving engineering and technical challenges from more than 175 locations nationwide.

Its talented employee-owners provide on-time and real-time data-driven insights to create an unmatched client experience that spans the lifecycle of any project, any size, anywhere.​

Terracon ranks 21st on the Engineering News-Record list of Top 500 Design Firms and is ranked No. 1 in Asbestos and Lead Abatement Design.

To learn more about Terracon visit