When people think of psychology, many tend to think of Sigmund Freud (1856–1939).
His work supported the belief that not all mental illnesses have physiological causes and he also offered evidence that cultural differences have an impact on psychology and behavior. His work and writings contributed to our understanding of personality, clinical psychology, human development, and abnormal psychology. Freud is also known as the founding father of psychoanalysis first qualified as a doctor of medicine at the University of Vienna. Freud went on to work in cerebral anatomy and his fascination with the brain developed from there. Freud died in 1939 but his legacy lives on with many of his theories providing the basis for modern clinical psychology.