Onterra Staff


Timothy A. Hoyman, CLM

Tim Hoyman is the founder of Onterra, LLC and the firm’s lead aquatic ecologist. Tim holds a Bachelor of Science degree in Biology and Chemistry from UW-Whitewater and a Master of Science degree in Limnology from Iowa State University. Tim is one of Wisconsin’s six Certified Lake Managers (CLM) through the North American Lake Management Society. Tim is a true aquatic ecologist that has been specializing in lake management for over a decade.

Being the lead ecologist, Tim is deeply involved with every project Onterra undertakes. His abilities as an aquatic ecologist and planner are known throughout the state.


Eddie J. Heath

Eddie Heath has been with Onterra, LLC since its creation in early 2005. Eddie holds a Bachelor of Science degree in Environmental Science from St. Norbert College and a Master of Science degree in Environmental Science and Policy from the University of Wisconsin-Green

Eddie currently manages numerous projects within the firm and is key in the completion of most field surveys. Eddie also provides most of the GIS mapping and analysis used in Onterra reports and management plans.


Craig R. Stettner

Craig Stettner is a part-time employee of Onterra, LLC and assists with the completion of field studies during the summer months. During the non-summer months Craig teaches Environmental Science, Zoology, and Biology at Harper College in Chicago, IL. Craig holds a Bachelor of Science degree in Fisheries Biology from Purdue University, a Master of Science degree in Fisheries and Aquatic Science from Ball State University, and a Master of Science degree in Education, Biology, and Ecology from

Craig’s extensive background in ecology has made him a key member of the Onterra’s field crew and has substantially increased the ’s capacity.