David O is an educator, physician, attorney, and former three-term member of the Indiana House of Representatives. A Democrat and a resident of Terre Haute, he has practiced both medicine and law, and he teaches health care law and ethics, constitutional law, and other topics at Indiana University School of Medicine in Terre Haute, IU School of Medicine in Indianapolis, and IU Robert H. McKinney School of Law.

Nationally recognized for his expertise in medical ethics and health policy, David O has testified before Congress, authored legal briefs for the Supreme Court, and served on many advisory groups for the government and not-for-profit organizations.

While directing the medical ethics program at the American Medical Association David O drafted the AMA's first ever Patients' Bill of Rights. He also wrote conflicts of interest guidelines that protect the integrity of the patient-physician relationship. 

A graduate of Harvard Medical School and Harvard Law School, David O has written many books and articles on a wide range of topics in ethics, law, and medicine. His current project, "Economic Inequality and College Admissions Policies," makes the case for revising college admissions policies to address the serious problem of economic inequality in the United States. 

David O's wife, Judy, is a professor of political science at Indiana University. They have two children.