Watershed Ecology Staff

Stefanie Kroll, Ph.D.

Assistant Research professor; Section leader Watershed Ecology;
Project Science Director for the Delaware River Watershed Initiative

Stefanie Kroll has a PhD in ecology from SUNY College of Environmental Science and Forestry in Syracuse, NY. She obtained a master’s-equivalent at the University of Castilla-La Mancha in Albacete, Spain, after working in interpretation and translation and teaching English for several years. Her focus on aquatic ecosystems is not surprising given that she grew up spending summers fishing and canoeing in the lakes and streams of New York State and surrounding areas. She volunteers with the Raritan Headwaters Association and Big Brothers Big Sisters of Southeastern Pennsylvania and works with ANS’ Women In Natural Sciences program. Previous work includes forest inventory, program support for a nonprofit environmental organization, community assessment of Onondaga Lake, and stream surveys throughout Spain.

Past Members

Hayley Oakland

Staff Scientist

Hayley Oakland

Hayley is a staff scientist in the watershed ecology section. She assists with data collection and analysis, report and grant writing, and project management. She has worked at the Academy of Natural Sciences of Drexel University since 2015, which has included managing the Growing Greener project under PI Stef Kroll, Ph.D. Hayley is pursuing a master’s of science in the Geography and Environmental Systems (GES) department at the University of Maryland, Baltimore County under the advisement of Matthew Baker, Ph.D. She holds a Coastal Resilience and Sustainability Fellowship from the Maryland Sea Grant, under which she will study the relationship between stream habitat and biota with Drs. Kroll and Baker. Hayley received her bachelor of science in 2014 from the University of Oregon in environmental science and a minor in biology.

Boloroo Erdnee

Research Assistant for Patrick Center of Environmental Research;
PhD Student, BEES Department, Drexel University


Boloroo is a PhD student within the department of Biodiversity, Earth and Environmental Sciences at Drexel University working as a Research Assistant for the Academy’s Patrick Center for Environmental Research. With a focus on central and Western Mongolian macroinvertebrate fauna, Boloroo brings her mayfly expertise to the lab with nearly a decade of taxonomic experience. Her doctoral work includes macroinvertebrate populations from western U. S. and eastern Pennsylvania utilizing Mongolian’s pristine aquatic ecosystems as reference conditions.