“…For example, the Topology Group took ownership of field theory; the RCGD concentrated on group dynamics; the NTL devoted itself to T-groups. Alfred Marrow, Lewin’s biographer, was active in most of them and was one of the few, along with Douglas McGregor, Richard Beckhard, and Herbert Shepard, who seemed to adhere to a form of Lewin’s model (Freedman, 1999; French, 1982; Marrow, 1972; Marrow, Bowers, & Seashore, 1967; McGill, 1974).…”