- Brian Liesch – Managing Principal
- James deLambert – Senior Hydrogeologist, Principal
- John Lichter – P.E., Principal
- Kenneth Olson –C.P.G, Principal
- Hal Summitt – P.E., Principal
- Dana Wagner – CHMM, Principal
- James Bullert – P.E., Partner
- Eric Hesse – P.E., Partner
- Mike Johnson – P.E., Partner
- Mat Knutson – Environmental Engineer, Partner
- Michael McCoy – P.E., Regional Manager
- Joe McGovern – Partner, Regional Manager
- Bruce Rehwaldt – P.E., Partner
- David Reynolds – P.E., Partner
- Erik Sundbo – Environmental Scientist
- Warren Tuel – Wetland and Soil Scientist, Engineering Technician, Certified Wetland Delineator
- Mike Willey – Project Manager
Our multidisciplinary staff of over 80 professionals includes: civil, environmental, and chemical engineers; biologists; geologists; hydrogeologists; environmental scientists; industrial hygiene specialists; asbestos specialists; water resource scientists; construction inspectors and hazardous waste managers.