This article focuses on the author's activities in the United States relating to the history of psychology. It does not deal with his involvement in applied psychology in Europe (1937-1939), and it only touches on research on malnutrition and behavior, illumination and performance, and aging carried out in the Laboratory of Physiological Hygiene at the University of Minnesota (1941-1958). Activities bearing on the history of psychology dominated the years spent at Lehigh University (1959-1979) and the years of retirement (1979-present). The principal events include organizing the first scientific meeting of the American Psychological Association's Division 26, History of Psychology (1966); two summer institutes on the history of psychology (1968, 1971); the editing of a historically oriented volume on psychology in the USSR (1972) and of R.I. Watson's papers on the history of psychology (1977); organizing and editing a volume containing 6 monographs on the history of psychology in the United States (1984); and editing a volume concerned with international research during the years 1919-1981 on malnutrition and behavior.