1890 - Born into a Jewish family in Mogilno, Poland (then Germany)on the 9th of September. 1922 - Lewin coined the notion of genidentity, which has gained some importance in various theories of space-time and related fields. 1933 - He emigrated to the United States in August and became a naturalized citizen in 1940. 1937 - He also proposed Herbert Blumer's interactionist perspective as an alternative to the nature versus nurture debate, in that he suggested that neither nature nor nurture alone can account for individuals' behavior and personalities, but rather that both nature and nurture interact to shape each person. 1946 - Received a phone call from the Director of the Connecticut State Inter Racial Commission, requesting his help in finding an effective way to combat racial and religious prejudices. 1947 - He died in Newtonville, Massachusetts of a heart-attack on the 12th of February. - Led to the establishment, of the National Training Laboratories, at Bethel, Maine. Carl Rogers wrote of sensitivity training as "perhaps the most significant social invention of this century." 1949 - He completed his Ph.D., with Carl Stumpf as the supervisor of his doctoral thesis.
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