Thomas Callister Hales

Thomas Hales
Born	(1958-06-04) June 4, 1958 (age 65) San Antonio, Texas
Nationality	American
Alma mater	Princeton University
Known for	Proving Kepler conjecture
Awards	Chauvenet Prize (2003) David P. Robbins Prize (2007) Fulkerson Prize (2009) Tarski Lectures (2019)
Scientific career
Fields	Mathematics
Institutions	University of Pittsburgh[1] University of Michigan
Doctoral advisor	Robert Langlands
Doctoral students	Julia Gordon
Website	sites.google.com/site/thalespitt/

Thomas Callister Hales (born June 4, 1958) is an American mathematician working in the areas of representation theory, discrete geometry, and formal verification. In representation theory he is known for his work on the Langlands program and the proof of the fundamental lemma over the group Sp(4) (many of his ideas were incorporated into the final proof of the fundamental lemma, due to Ngô Bảo Châu). In discrete geometry, he settled the Kepler conjecture on the density of sphere packings and the honeycomb conjecture. In 2014, he announced the completion of the Flyspeck Project, which formally verified the correctness of his proof of the Kepler conjecture.