Benton-Harris studied at the Alexey Brodovitch Design Workshop in New York City.
He was a self-employed photographer working in the field of photojournalism. He was a visiting lecturer at a variety of institutions, such as Trent Polytechnic in Nottingham (1973-76), West Surrey College of Art & Design in Farnham (1977, 1979) and the London College of Printing (1978 through 1980).
Working in a documentary tradition, utilizing small-format black-and-white, he focused on cultural and historical identities. In England he was interested in "making public the private spectacle of upper-class life and the belief in empire."