The "Chicago Five" was a group of integrative psychobiologists, including Frank A. Beach, Donald O. Hebb, David Krech, Norman R. F. Maier, and Theodore C. Schneirla, all of whom worked with Karl S. Lashley at the University of Chicago during 1929 -1935. Although they went on to careers in diverse fields of psychology, their approaches reflect a set of underlying themes that can be traced to their experiences in Chicago. Nine primary beliefs that, with occasional exceptions, underlie their work are delineated. The term family is proposed to refer to a group of psychologists who share a common professional development in one place within a limited time period and whose later work although it may be diverse, reflects commonalities that may be traced to that experience.