The part of Columbia that employs Dr. Oz (New York-Presbyterian Hospital / Columbia University Medical Center and Columbia University College of Physicians & Surgeons) is only marginally related to the part of Columbia University that grants PhDs in International relations. Theoretically, Lee Bollinger, president of the university, is the top administrator of all facets of the university, including the medical center and medical school. But NYP has a CEO and the CUMC campus has its own chief executive, who is also the head of the medical school. In reality, Lee Bollinger would have little to no influence over Dr. Oz.