Harriet Ritvo joined the Massachusetts Institute of Technology as a lecturer in the Humanities Department in 1979 and was promoted to assistant professor in 1980. In 1985, she was promoted to associate professor and then full professor in 1987. She has been teaching as the Arthur J. Connor Professor of History at MIT since 1995. From 1999-2006, Ritvo served as the head of the History Faculty at MIT as well as the director of Graduate Studies for the History, Anthropology, and Science, Technology and Society (HASTS) program from 2011-2013 and 2017-2018.