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Thomas Hales

Thomas Hales, an American mathematician with gray hair and glasses, gestures with his right hand while wearing a dark suit jacket over a striped shirt and sweater vest.

American mathematician, born 1958, now at the University of Pittsburgh. In 1998 he announced a computer-assisted proof of the Kepler conjecture on sphere packing, a problem open since 1611. His shorter 1999 proof of the honeycomb conjecture closed a question first posed by Varro and formalised by Pappus. He has since led the Flyspeck project to mechanically verify his Kepler proof.

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