Gary P. Hamel (born November 9, 1954) is an American management consultant. He is a founder of Strategos, an international management consulting firm based in Chicago. Biography. Hamel was born on November 9, 1954, in St. Joseph, Michigan. He graduated from Andrews University in 1975, and from Ross School of Business at the University of Michigan in 1990. https://en.wikipedia.org/wiki/Gary_Hamel