The Chapman family were long time residents of Cheyenne, Wyoming. Albert Chapman was a prominent banker, realtor, and businessman of the city. His son, Mark A. Chapman, was chairman during the organizational meeting of the Cheyenne branch of the Wyoming State Historical Society (September 26, 1923). Throughout his life Mark Chapman collected documents and information relating to the history of Cheyenne and the State of Wyoming.
From the guide to the Mark A. Chapman collection, 1834-1942, (University of Wyoming. American Heritage Center.)