Sheldon Fox, a co-founder of New York–based Kohn Pedersen Fox Architects (KPF), died on Dec. 16, 2006, at his home in Fairfield, Conn. Fox was born in the Bronx, N.Y., and studied architecture at the University of Pennsylvania. After serving in Korea, he joined Kahn & Jacobs in 1955, rising to the rank of partner before taking a position with John Carl Warnecke & Associates in 1972. KPF opened its doors in 1976, with Fox managing operations, William Pedersen serving as designer, and Eugene Kohn taking responsibility for marketing. Under their joint leadership, KPF emerged as one of the world's most prominent firms. Fox retired in 1996.