Thomas F. Gieryn (born 1950) is Rudy Professor of Sociology at Indiana University. He is also the Vice Provost of Faculty and Academic Affairs. In his research, he focuses on philosophy and sociology of science from a cultural, social, historical, and humanistic perspective. He is known for developing the concept of "boundary-work," that is, instances in which boundaries, demarcations, or other divisions between fields of knowledge are created, advocated, attacked, or reinforced. He has served on many councils and boards, including the advisory board of the exhibition on "Science in American Life" by the Smithsonian's National Museum of American History. He retired in 2015 from his professorship at Indiana University.