Duquesne has graduated at least three and two cardinals in the Roman Catholic Church, including Bishops David Zubik, who is the current ordinary of the Roman Catholic Diocese of Pittsburgh; Vincent Leonard; and David Bonnar, the Bishop of the Roman Catholic Diocese of Youngstown and Cardinals Daniel DiNardo and Adam Maida. Figures in politics include Donald A. Bailey, Father James Cox, former Director of the CIA General Michael V. Hayden, former Lieutenant Governor of Pennsylvania Catherine Baker Knoll, U.S. Representative from Pennsylvania Bud Shuster and United States ambassadors Thomas Patrick Melady and Dan Rooney. Duquesne has many alumni in the sciences including George Delahunty.