Dave Sharrow retired after working from 1997 to 2018 as a hydrologist/geologist for Zion NP, and Pipe Spring NM and Cedar Breaks NM. Between 1992 and 1997 he worked for the NPS Water Resources Div. and 1988 to 1991 for the NPS Geologic Resources Division. He worked at Grand Canyon NP from 1980 to 1987 in Natural Res. Mgt. Dave has a B.S. (1976) in Watershed Hydrology from the University of Arizona. He was born in Tucson, Arizona.