William John Crozier

William John Crozier (May 24, 1892 in New York City – November 2, 1955 in Belmont, Massachusetts) was an American physiologist who influenced psychology through his theory and experimentation on animal behavior and the sensory processes.

Crozier ran a physiology laboratory in which he stressed the behavior of the whole organism and the need to control behavior in order to understand it. It was in Crozier's lab that B.F. Skinner, working largely without supervision, pursued his experimental research on animal behavior.