Douglas A. Harper (born 1948) is an American sociologist and photographer. He is the holder of the Rev. Joseph A. Lauritis, C.S.Sp. Endowed Chair in Teaching with Technology at Duquesne University, a chair funded by a grant from the Mellon Foundation.
Harper was born in Saint Paul, Minnesota, United States. He earned a B.A. from Macalester College in 1970 and a Ph.D. in sociology from Brandeis University. While doing research for his Ph.D. dissertation about railroad tramps, he rode freight trains for 20,000 miles (32,000 km) in the western United States.
After graduation, Harper wrote a book, Good Company, about railroad tramps.
Harper made extensive use of photo elicitation interviews in his 1987 book, Working Knowledge, a sociological treatment of the rural bricoleur in America. His 2001 publication, Changing Works, applied the same method to the historical reconstruction of cultural memory.
Harper later co-authored books on post-colonial culture in Hong Kong, Italian food culture, and the semiotics of Italian fascism, in which he researched images as method of cross-cultural communication. In 2014, he studied the sociology of public space in the Italian piazza and in the de-industrialized regions of the American Rust Belt.
Harper has taught sociology at SUNY Potsdam, the University of South Florida, and Duquesne University, and as a guest professor at the University of Amsterdam and University of Bologna. He edited the academic journal Visual Studies during its first thirteen years and wrote five works of visual ethnography published by the University of Chicago Press. His Visual Sociology (Routledge 2012) is a comprehensive treatment of the topic.