Thomas Callister Hales

Thomas Hales
Born	(1958-06-04) June 4, 1958 (age 66) San Antonio, Texas
Nationality	American
Alma mater	Princeton University University of Cambridge Stanford University
Known for	Proof of the Kepler conjecture Proof of the honeycomb conjecture Proof of the dodecahedral conjecture
Awards	Chauvenet Prize (2003) Moore Prize (2004) David P. Robbins Prize (2007) Lester R. Ford Award (2008) Fulkerson Prize (2009) Tarski Lectures (2019) Senior Berwick Prize (2020)
Scientific career
Fields	Mathematics
Institutions	University of Pittsburgh University of Michigan University of Chicago Harvard University
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, the honeycomb conjecture, and the dodecahedral conjecture. In 2014, he announced the completion of the Flyspeck Project, which formally verified the correctness of his proof of the Kepler conjecture.