Chair of Free Enterprise at the University of Tennessee at Chattanooga.

[1] Clark held a series of national level administrative positions with the Joint Council on Economic Education in New York from 1974 to 1980.

Clark holds an Airline Transport Pilot rating and currently flies light jet aircraft.

In 2006, he was elected to the board of directors for The Mont Pelerin Society, vice president in 2010, and treasurer in 2014.

In 2012, he served as vice president, freedom and free enterprise, at the John Templeton Foundation.