Meet Gei's

Mariana L. Dallapiazza Olson

Wetland Ecologist

Mariana “Mari” L. Dallapiazza Olson is a wetland ecologist and project manager in GEI’s Milwaukee, WI office. She is an Assured Wetland Delineator through the Wisconsin Department of Natural Resources. Her 9 years of experience includes wetland delineations/determinations, wetland and waterway permitting, aerial photography interpretation, natural habitat assessments, threatened and endangered species surveys, and invasive species management. Mari has participated in over 150 wetland delineations/determinations in the Midwest since 2016. She is also experienced with local, state, and federal environmental permitting including U.S. Army Corps of Engineers Jurisdictional Determinations and Wisconsin Department of Natural Resources Artificial and “Nonfederal” Exemption Requests.

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Milwaukee, Wisconsin


  • WDNR Assured Wetland Delineator
  • Wisconsin Wetland Association (member)