Lewin immigrated 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,[3] 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. Later, he went on to become director of the Center for Group Dynamics at MIT. While working at MIT in 1946, Lewin received a phone call from the Director of the Connecticut State Inter Racial Commission [4]requesting help to find an effective way to combat religious and racial prejudices. He set up a workshop to conduct a 'change' experiment, which laid the foundations for what is now known as sensitivity training.[5] In 1947, this led to the establishment of the National Training Laboratories, at Bethel, Maine. Carl Rogers believed that sensitivity training is "perhaps the most significant social invention of this century