Thomas J. Leonard (July 31, 1955 - February 11, 2003) was a major contributor to the development of personal coaching. He was an EST employee in the 1980s and founded Coach U, the International Coach Federation, Coachville, and the International Association of Coaches as the manager of its accounting department. He participated in the foundation of the Coaches Training Institute deeply. He was the founder concerned with establishment of the other companies and organizations of coaching.