Field theory is a psychological theory which examines patterns of interaction between the individual and the total field, or environment. The concept first made its appearance in psychology with roots to the holistic perspective of Gestalt theories. It was developed by Kurt Lewin, a Gestalt psychologist, in the 1940s.
Lewin’s field theory can be expressed by a formula: B = f(p,e). B being the function between the person (p) and their environment (e)