Leif brings over 15 years of experience in diverse aspects of applied ecological and environmental science.  He is a leading authority on bumble bee species–their taxonomy, ecology, distribution, and conservation–and an expert on crop pollination and pesticide risk assessment. At Stone, Leif draws from his extensive field and lab research on both honey bees and native bees, such as mason bees and bumble bees, to manage and conduct pesticide risk assessments for bees, endangered species inventory and stewardship, and bee species diversity surveys.
Prior to joining Stone, Leif completed a Postdoctoral Research Fellowship at the Gund Institute for Ecological Economics, University of Vermont, where he studied interactions between crops, pollinators, and mycorrhizal fungi. He is co-author of the 2014 field manual Bumble Bees of North America: An Identification Guide Leif also worked for a decade as an ecologist with the Vermont ANR,and has extensive natural resource management expertise, including in land cover mapping, forestry, and game species management.
Years of Experience 17
Years at Stone 2
Ph.D., Dartmouth College, Ecology and Evolutionary Biology, 2014
M.S., University of Arizona, Ecology and Evolutionary Biology, 1999
B.A., Earlham College, Biology, 1994