Abraham Harold Maslow is born in Brooklyn, New York. An American psychologist who will play a key role in the development of modern humanistic psychology, Maslow becomes best known for of his theory of four different levels of motivation which describes the process by which individuals fulfill their needs.
Abraham Maslow's levels are: 1. biological needs; 2. safety and security; 3. love and belongingness; and 4. self-esteem. The earlier levels are the most basic and the later levels build upon the former.
The goal of understanding these different motivations, according to Maslow's humanist psychology, is to provide for the self-actualization of the individual. A person whose different levels of needs are fulfilled is a person who has a "more efficient" perception of reality because that perception is not distorted by unfulfilled needs eating away at them.
Such a person is also more resistant to social repression and indoctrination, has a stronger sense of friendship with others, and is more spontaneous and creative.