Cleo Wölfle Hazard’s research focuses on ecological and social dimensions of human relations to rivers and their multi-species inhabitants. Trained in ecology, hydrology, geomorphology, critical social science, and feminist science and technology studies, he facilitates collaborative research in partnership with tribes, agencies, citizen scientists, and local community members. He is developing research projects on hydro-ecological and social effects of beaver relocation in eastern Washington, and environmental justice dimensions of fishing and shellfishing in urban Puget Sound. As a UC President’s Postdoctoral Fellow in Feminist Studies at UC Santa Cruz, he explored queer, transgender and decolonial possibilities for ecological science.