Charles Sims (mathematician)
Charles Coffin Sims (born 1938) is an American mathematician best known for his work in group theory. Together with Donald G. Higman he discovered the Higman–Sims group, one of the sporadic groups. The permutation group software developed by Sims also led to the proof of existence of the Lyons group (also known as Lyons-Sims group) and O'Nan group (also known as O'Nan-Sims group).
Sims was a student of John Thompson and received Ph.D. from Harvard University in 1963. In his thesis he enumerated p-groups, giving sharp asymptotic upper and lower bounds. He currently works at Rutgers University.
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