Hubert Kennedy, PhD, (born 1931) was Professor of Mathematics at Providence College (Rhode Island), where his research interest was the history of mathematics. He moved to San Francisco in 1986 to continue his historical research in the beginnings of the gay movement in Germany. Since 2003 he has been in a home for assisted living in Concord, California, where he continues to bring the writings of the German anarchist writer John Henry Mackay back into print. In addition to his interest in Mackay, Kennedy has written biographies of the Italian mathematician Giuseppe Peano and the German homosexual emancipationist/theorist Karl Heinrich Ulrichs.