Koffka, she helped Heider find an apartment in Northampton and introduced him to the environs (Heider, 1983). They were married in 1930, and the marriage lasted for more than 50 years. The couple had three sons: Karl, John, and Stephan. His son Karl Heider went on to become an important contributor to visual anthropology and ethnographic film whereas his son John wrote the popular The Tao of Leadership. In 1948, Heider was recruited to the University of Kansas, by social psychologist Roger Barker (Heider, 1983). He remained in Kansas for the remainder of his life. In 1983, Heider documented his personal, career developments and achievements in his autobiography The Life of a Psychologist: An Autobiography. He died at his home in Lawrence, Kansas, on 2 January 1988 at the age of 91. His intellectual legacy still lives on. His wife of 57 years, Grace, died in 1995. His son John died in 2010. Work Heider published two important articles in 1944 that pioneered the concepts of social perception and causal attribution: Social perception and phenomenal causality, and, with co-author Marianne Simmel, An experimental study of apparent behavior. Heider would publish little else for the next 14 years. In 1958, at the University of Kansas, Heider published his most famous work, which remains his most significant contribution to the field of social psychology. The Psychology of Interpersonal Relations was written in collaboration with the uncredited Beatrice Wright, a founder of rehabilitation psychology. Wright was available to collaborate because the University of Kansas's nepotism rules prohibited her from a position at the University (her husband, Erik Wright, was a professor), and the Ford Foundation gave Heider funds and assistance to complete the project. (Wright is credited only in the Foreword; she later went on to become an endowed professor of psychology at the University of Kansas). In his book, Heider presented a wide-ranging analysis of the conceptual framework and the psychological processes that undergird human social perception. The Psychology of Interpersonal Relations pioneered attribution theory. A giant of social psychology, Heider had few students, but his book on social perception had many readers, and its impact continues into the 21st Century, having been cited over 26,000 times. Heider introduced two theories that correspond to his two articles from 1944: attribution theory and cognitive balance. The Psychology of Interpersonal Relations illuminates a sophisticated approach toward naive or common-sense psychology. In The Psychology of