Théodore Simon

Born in Dijon on July 10, 1873, Théodore Simon was a French psychiatrist and psychologist whose name is closely linked with Alfred Binet. Working together in the early 1900s, they developed the Binet-Simon scale, an influential early intelligence test created to assess children's cognitive abilities.

Simon worked in hospitals and in child psychiatry, and his medical background helped ground the Binet-Simon project in real clinical observation rather than abstract theory alone. The scale was revised over time and became a foundation for later intelligence testing, giving Simon an enduring place in the history of psychology.

He died in Paris on September 4, 1961. Though Binet's name is often more widely recognized, Simon's role in shaping one of psychology's most important assessment tools remains central to his legacy.