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Thomas Thewes (December 9, 1931 – September 28, 2008) was an American entrepreneur and businessman. He was vice chairman and a co-founder of Compuware Corporation along with Peter Karmanos and Allen Cutting.
Thewes was a graduate of the University of Detroit. He and his wife, Beverly, resided in metropolitan Detroit and had six children. Thewes was a benefactor to several philanthropic interests. He died after a two-year fight with leukemia.