Edward L. (Edward Lee) Thorndike

Born in Williamsburg, Massachusetts, in 1874, Edward Lee Thorndike studied at Wesleyan University, Harvard, and Columbia. He spent most of his career at Columbia University and became one of the leading figures in early experimental psychology.

Thorndike is especially remembered for his studies of animal learning. In his puzzle-box experiments, animals learned through trial and error, leading him to develop connectionism and the law of effect—the idea that responses followed by satisfying results are more likely to be repeated. These ideas became deeply influential in psychology and education.

He also helped push education toward measurement and testing, arguing that learning could be studied with careful data rather than impression alone. Even when he later revised some of his own conclusions, his work remained foundational for behaviorist research and modern educational psychology.