Kurt Lewin
Kurt Zadek Lewin or Kurt Tsadek Lewin (9 September 1890 – 12 February 1947) was a German-American psychologist, known as one of the modern pioneers of social, organizational, and applied psychology in the United States.
Source: Wikipedia, Kurt Lewin. Text licensed CC BY-SA 4.0. Not endorsed by or affiliated with Wikipedia or the Wikimedia Foundation.