Over the course of his career, John has had the privilege of playing diverse leadership roles in government, diplomacy, politics, philanthropy and academia at the global, national, and state/local levels. His focus has been on managing complex health, social service, and development issues and programs affecting low-income and vulnerable populations in the United States and abroad. He currently serves at Georgetown University as a professor in medicine, lecturer in law, and as the senior advisor for global initiatives to the president of Georgetown.