Dr. Steven Nissen
I have an offbeat suggestion. For the last 25 years, Larry King has interviewed heads of state, kings, scoundrels, politicians, scientists and every variety of international figure. On Dec. 16 he will end his 25-year reign as the world's most influential interviewer. I can't think of someone more influential over such a long period of time.
Nissen is the chairman of the Department of Cardiovascular Medicine, Cleveland Clinic