Allan Gibbard

Allan Gibbard (born 7 April 1942) is an American philosopher, the Richard B. Brandt Distinguished University Professor of Philosophy at the University of Michigan. He took a B.A. with high honors at Swarthmore College in 1963 as a mathematics major, taught secondary school mathematics and physics at Achimota School in Ghana with the U.S. Peace Corps from 1963 to 1965, and received his Ph.D. from Harvard University in 1971. He taught at the University of Chicago from 1969 to 1974 and at the University of Pittsburgh from 1974 to 1977, and has been at Michigan since 1977. His proof that every non-dictatorial voting scheme with three or more outcomes can be manipulated by a voter is known as Gibbard's theorem and, with Mark Satterthwaite's independent result, as the Gibbard-Satterthwaite theorem.