If you want truly to understand something, try to change it.

D. Lewin emigrated to the United States in August 1933 and became a naturalized citizen in 1940. Earlier he had spent six months as a visiting professor at Stanford in 1930 but on his immigration to the United States Lewin worked at Cornell University and for the Iowa Child Welfare Research Station at the University of Iowa.

Lewin (/ləˈviːn/ lə-VEEN) is often recognized as the "founder of social psychology" and was one of the first to study group dynamics and organizational development.