1901 — The College Entrance Examination Board tests were first administered.
1919 — William K. Estes was born. Estes's early work with B. F. Skinner led to increasingly precise mathematical descriptions of learning. Later work concentrated on cognitive organization of learned elements in memory and mathematical models of learning. APA Distinguished Scientific Contribution Award, 1962; American Psychological Society William James Fellow, 1990.
1924 — Robert M. Ogden of Cornell University wrote to German psychologist Kurt Koffka, inviting him to become a visiting lecturer. This was the first step in a process that brought Gestaltists Koffka, Köhler, Wertheimer, and Lewin to America, largely through Ogden's efforts.
1955 — The journal Psychological Reports published its first issue. Robert B. Ammons and Carol H. Ammons were the journal's editors.
1957 — The first Air Force Interdisciplinary Behavioral Sciences Conference began at the University of New Mexico. The conference organizers were Paul Walter, Jr., and Ralph D. Norman.
1971 — The petition to create APA Division 32 (Humanistic Psychology) was submitted. Don Gibbons was instrumental in forming the division.
1994 — U.S. Navy Commander John L. Sexton and Lieutenant Commander Morgan T. Sammons graduated from the Walter Reed Army Medical Center, becoming the first psychologists legally trained to prescribe psychoactive drugs. Sexton and Sammons were psychopharmacology fellows while at Walter Reed.
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