Tom Buchholz, MD. Executive Vice President and Physician-in-Chief of MD Anderson Cancer Center (Houston). Dr. Buchholz is a tenured professor and chair of the radiation oncology department at The University of Texas MD Anderson Cancer Center in addition to his role as executive vice president and physician-in-chief of the system. He has authored more than 100 scientific articles on breast cancer research and has been named to Newsweek's America's Top Doctors list every year since 2003. Dr. Buchholz is board-certified in radiation oncology and has been in practice for 27 years.