Joseph Weizenbaum (1923-2008) was a German-American computer scientist and a professor at the Massachusetts Institute of Technology, as recorded in MIT’s own obituary. He is best remembered for two things that sit in tension: creating one of the first famous chatbots, and later becoming one of artificial intelligence’s most thoughtful critics.
In 1966 Weizenbaum built ELIZA, a program that carried on typed conversations using simple pattern matching, described in his paper in Communications of the ACM. Its best-known script imitated a psychotherapist by reflecting users’ statements back as questions. Weizenbaum was disturbed to find that people readily poured out their feelings to the program and attributed real understanding to it, despite knowing it was only a simple script, a reaction now called the ELIZA effect.
That experience turned him into a skeptic of overblown AI claims. In his 1976 book “Computer Power and Human Reason: From Judgment to Calculation,” he argued that there are things computers should not be made to do even if they can, and that delegating genuinely human judgments to machines is dangerous. He drew a sharp line between deciding, which computers can do, and choosing, which he held required human wisdom and responsibility.
Why business readers should care: Weizenbaum is the original cautionary voice about people over-trusting conversational software, an issue that is sharply relevant in the age of chatbots and large language models. His distinction between what AI can do and what it should be trusted to decide remains a useful frame for responsible AI adoption.