Jeff's research focus is on linking hydrological and geomorphic conditions in rivers to the structure of aquatic communities. His work focuses on aquatic insects and macroinvertebrates, salmonid fishes and feeding ecology, and freshwater and riparian food webs. He is involved in basic and applied research in a variety of river ecosystems worldwide. His current role at USGS is at the Alaska Cooperative Fisheries and Wildlife Research Unit as the Unit Leader, in cooperation with the University of Alaska Fairbanks and partners.