Erich Gamma is technical director at the Software Technology Center of Object Technology International in Zurich, Switzerland.

Richard Helm is an e-business consultant and architect with Platinion in Sydney, Australia.

Ralph Johnson is a faculty member at the University of Illinois at Urbana-Champaign's Computer Science Department.

John Vlissides conducts his research at IBM's Thomas J. Watson Research Center in Hawthorne, New York.