Kurt Lewin founded the National Training Laboratories, known as NTL, an American non-profit behavioral psychology center, in 1947.
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It was pioneered in the mid-1940s by Moreno's protege Kurt Lewin and his colleagues as a method of learning about human behavior in what became The National Training Laboratories (now NTL Institute of Behavioral Science) that was created by the Office of Naval Research and the National Education Association in Bethel, Maine, in 1947.