1942 - Carl Rogers developed client-centered therapy and publishes Counseling and Psychotherapy. His approach encourages respect and positive regard for patients.
1952 - The Diagnostic and Statistical Manual of Mental Disorders is published.
1954 - Abraham Maslow publishes Motivation and Personality, describing his theory of a hierarchy of needs. He also helps found humanistic psychology.
1958 - Harry Harlow publishes The Nature of Love, which describe his experiments with rhesus monkey 's on the importance of attachment and love.
1961 - Albert Bandura conducts his now famous Bobo doll experiment.
1963 - Albert Bandura first describes the concept of observational learning to explain personality development.
1974 - Stanley Milgram