23 East Fine Avenue, Flagstaff, Arizona 86001

About Us

Environmental Consulting and Regulatory Compliance

Our Team

EnviroSystems consists of a team of highly trained professionals with over 150 years of combined experience in environmental regulatory compliance, natural and biological resources management, archaeological/cultural resources management, geospatial and GIS services, noxious weed management, and public relations. Our Division Directors and Project Managers build customized teams of qualified full-time, part-time, and temporary professionals for each project to match the needs of our clients.

Stephanie A. Treptow, B.S., CEI/CES/CEC, Q.P.

President / Principal-In-Charge / Interim Natural Resources Division Director

David R. Hart, M.A., RPA

Vice President / Cultural Resources Division Director

Christine Markussen, M.A., RPA

Vice President / Geospatial/  GIS Division Director

Josh Whiting, M.A., RPA

Principal Investigator / Project Manager / Senior Archaeologist

Stewart Deats, M.Ed.

Principal Investigator / Project Manager / Lab Director / Senior Archaeologist

Christopher Papalas, Ph.D. RPA

Principal Investigator / Project Manager / Supervisory Archaeologist

Blayne R. Brown, B.A.

Supervisory Archaeologist / Project Director / Scientific Illustrator

Travis I. Ellison, B.A.

GIS specialist / Supervisory Archaeologist

Ehren D. Keltz, M.A., RPA


Crispin A. Wilson, M.A., RPA

Supervisory Archaeologist

Nick K. Uehling, B.S., CEI/CEC

Vegetation Management Program Coordinator / Natural Resources Specialist

Kristin A. Miller, B.S., CEI

NEPA / Compliance Specialist

Joianne Meyers, B.S.

Office Manager