Stefanie Kroll, PhD, Department of Biodiversity, Earth and Environmental Science, Drexel University. Stefanie Kroll is the Watershed Ecology Section Lead at the Academy of Natural Sciences of Drexel University and Assistant Research Professor. Her research includes the use of multiple indicators of stream ecosystem integrity and their response to various anthropogenic stressors, potential recovery of communities after stream restoration, including agricultural Best Management Practices, and the effects of climate change on freshwater systems. She focuses on macroinvertebrates and diatoms, the foundation of the aquatic food web for fish and other river dwellers.