The classic of psychological and sociological research. The work of Kurt Lewin (1890-1947) has had a lasting impact on many areas of psychology. With his motivational perspective on human behavior, he not only shaped the thinking of subsequent generations but also provided the foundation for the development of numerous other psychological theories. Kurt Lewin established experimental social psychology with his writings. In his field theory, he postulates that human behavior must be analyzed in its overall context: "Psychology must consider the living space that encompasses the person and environment as a field." Lewin is still regarded as a pioneer in psychology. He has influenced both Gestalt and systemic therapy as well as sociology and political science. The field theory in the social sciences.