William D. Newmark is a research curator and conservation biologist in the Natural History Museum of Utah. He holds a B.A. in biology from the University of Colorado, an M.S. in wildland management from the University of Michigan, and a Ph.D. in ecology from the University of Michigan. His research focuses on patterns of vertebrate extinction, protected area and wildlife corridor design, animal movement, and captive-breeding and reintroduction. He has conducted field research in western North America and East Africa for four decades. From 2000 to 2019, he served as the lead technical consultant to the World Bank on the design and implementation of the species recovery program for the Kihansi Spray Toad.