He served as the United States Ambassador to Luxembourg from 1994 to 1999. Following his appointment to Luxembourg, he served for six years as the founding Dean of the John C. Whitehead School of Diplomacy and International Relations at Seton Hall University. Prior to his diplomatic service, Ambassador Constantinou practiced law in New Jersey. He has been active in national politics, spearheading the New Jersey Presidential campaigns of Governor Michael Dukakis, Governor Bill Clinton and Senator John Kerry. Ambassador Constantinou has earned an LL.M from NYU Graduate School of Law, a JD from Seton Hall University School of Law and a B.A. New Jersey City University. He was born in New York and resides in New Jersey with his wife and their two children.