This is a list of prominent alumni of the Phi Delta Theta fraternity. Names are listed followed by the school attended and their graduation year.
Academia
Liberty Hyde Bailey, Michigan State University, 1882 – horticulturist, botanist, father of modern horticulture Guy Potter Benton, Ohio Wesleyan, 1886 – president of Miami University (1902–1911); president of University of the Philippines (1921–1925) John R. Conniff, Tulane University, 1893 – educator; 7th president of Louisiana Tech University Steve Hanke, University of Colorado, 1964 – economist Joel Henry Hildebrand, University of Pennsylvania, 1903 – pioneer chemist Vernon Lyman Kellogg, University of Kansas, 1889 – entomologist Robert Khayat, University of Mississippi, 1960 – chancellor of the University of Mississippi (1995–2009) Charles Boynton Knapp, Iowa State University, 1967 – president of the University of Georgia (1987–1997) Frederic Brewster Loomis, Amherst College, 1896 – paleontologist William Harding Mayes, Vanderbilt University, 1881 – founder of the University of Texas School of Journalism; Dean (1914–1927) John D. Millett, DePauw University – president of Miami University Santa J. Ono, University of British Columbia – president of University of Michigan; president and vice-chancellor of University of British Columbia (2016-2022); President University of Cincinnati (2012–2016) Don K. Price, Vanderbilt University, 1931 – political scientist Adam G. Riess, M.I.T., 1992 – winner of the 2011 Nobel Prize in Physics Walter Riggs, Auburn University, 1892 – president of Clemson University (1910–1924) William C. Roberts, Southern Methodist University, 1954 – cardiologist and pathologist; first head of pathology for the National Heart, Lung and Blood Institute Andrew Sledd, Randolph-Macon College, 1893 – founding president of the modern University of Florida (1905–1909); president of Southern University (1910–1914); first professor of New Testament Literature at the Candler School of Theology, Emory University (1914–1939); Methodist minister and theologian John J. Tigert, Vanderbilt University, 1902 – president of Kentucky Wesleyan College (1909–1913); US Commissioner of Education (1921–1928); third president of the University of Florida (1928–1947) William G. Tight – president of the University of New Mexico (1902–1909) T. K. Wetherell, Florida State University, 1968 – president of Florida State University (2003–2009)
Aerospace and astronomy
Neil Armstrong, Purdue University, 1955 – Commander of Apollo 11 and first man to walk on the Moon William F. Durand, Michigan State, 1880 – first civilian chair of the National Advisory Committee for Aeronautics, the forerunner of NASA Jon McBride, West Virginia, 1964 – NASA astronaut, Space Shuttle Columbia F. Story Musgrave, Syracuse University, 1958 – NASA astronaut, Space Shuttle Challenger, Space Shuttle Columbia Thomas Jefferson Jackson See, University of Missouri, 1889 – astronomer for the United States Navy Joel Stebbins, University of Nebraska – Lincoln, 1899 – astronomer
Art and architecture
Francis Chapin, Washington & Jefferson College, 1921 – painter
Julian Franklin Everett, University of Wisconsin, 1894 – architect known for his work in Seattle Hank Ketcham, University of Washington, 1941 – cartoonist, creator of Dennis the Menace comic strip Frank Lloyd Wright, University of Wisconsin, 1888 – architect