Erich Fromm was a German-born U.S. psychoanalyst and social philosopher who explored the interaction between psychology and society. His works include The Art of Loving; Love, Sexuality, and Matriarchy; and Man for Himself. He died in 1980. Fromm's theory is a rather unique blend of Freud and Marx. Freud, of course, emphasized the unconscious, biological drives, repression, and so on. In other words, Freud postulated that our characters were determined by biology. Marx, on the other hand, saw people as determined by their society, and most especially by their economic systems.