John O'Keefe

Born in New York City in 1939, John O'Keefe became an American-British neuroscientist whose work reshaped modern brain science. He studied at City College of New York and McGill University, and later built his research career at University College London.

He is most widely known for discovering place cells in the hippocampus — brain cells that become active when an animal is in a particular location. That finding helped support the idea that the brain creates a kind of internal map, and it became a foundation for later research on spatial memory and navigation.

In 2014, he was awarded the Nobel Prize in Physiology or Medicine, shared with May-Britt Moser and Edvard Moser, for discoveries about the brain's positioning system. His work remains central to neuroscience because it connects memory, movement, and the brain’s sense of space in a way that is both elegant and deeply influential.