Mary Warner Marien is Professor Emerita in the Department of Fine Arts at Syracuse University, New York. She continues to lecture in the United States and Europe and in 2008 won an Andy Warhol Foundation Arts Writer award for her work on the history and theory of documentary photography. She is the author of Photography Visionaries (Laurence King, 2015) and 100 Ideas that Changed Photography (Laurence King, 2012, pocket edition 2020), as well as numerous articles on photography.