German-Jewish social psychologist, psychoanalyst, and one of the founding members of the Institute for Social Research (the Frankfurt School). Fromm's project — sustained across roughly a dozen books from the 1930s to the 1970s — was to fuse Freud and Marx into a theory of the social unconscious, asking why modern individuals so readily surrender freedom to authoritarian systems and what would be required to sustain a genuinely humane society. His answer was unfashionable even in his own time — he refused the tragic pessimism of Marcuse and Adorno — and has aged better than the academic orthodoxy that dismissed him.
Escape from Freedom (1941), written in American exile as fascism triumphed across Europe, is the central diagnostic book: modern freedom has severed the premodern ties (guild, estate, church) that once grounded identity, and the isolation, powerlessness, and anxiety this produces drive people toward "mechanisms of escape" — authoritarianism, destructiveness, and automaton-like conformity. The Sane Society (1955) extended the diagnosis to post-war consumer capitalism. The Art of Loving (1956), his most widely read book, argued that love in modernity had been commodified into a problem of finding the right object rather than understood as an active capacity that requires practice, discipline, and character — a surprisingly demanding book beneath its popular prose. To Have or To Be? (1976), his late synthesis, contrasted two modes of existence — the possessive "having" mode of modern industrial society against a "being" mode grounded in activity, presence, and relatedness.
Fromm broke with the Institute in the late 1930s (the other Frankfurters thought his humanism naive and his departures from orthodox Freudianism unrigorous) and spent the rest of his life as a public intellectual, practicing analyst, and socialist activist in the United States and Mexico. His popular success and his willingness to write for general readers cost him academic standing in his lifetime; the recovery of his work — especially his early studies of authoritarianism, which read as if written for the present — has been one of the quieter developments in recent intellectual history.