John Zimmerman was the senior vice president and a director of Kepner-Tregoe, Inc., a world-renowned management consulting firm. Benjamin Tregoe, now serving as the company's chairman emeritus, was CEO and co-founder of Kepner-Tregoe. They are the co-authors of Top Management Strategy and Vision in Action (with Ronald Smith and Peter Tobia). Tregoe is also the co-author (with Charles Kepner) of the seminal management books The Rational Manager and The New Rational Manager.