Arthur Van Horn was born at
Hackensack, in
Bergen County, New Jersey. His parents were Cornelius J. and Almira Van Saun. He worked and studied in
New York City, where he attended
The Cooper Union for the Advancement of Science and Art and received private instruction in the study of architecture. He moved to Bismarck and began as an independent architect in 1883. He worked with Karl A. Loven in
Van Horn & Loven during 1917–1919, and with
Robert A. Ritterbush and Clarence W. Ritterbush in
Van Horn & Ritterbush Brothers during 1920–1931. The Bismarck-based firm evolved as
Ritterbush Brothers during 1931–1974 and subsequently as
Ritterbush Associates. {{cite web|url= https://www.newspapers.com/clip/27109212/the_bismarck_tribune/|title = Robert Ritterbush, Bismarck Architect|website= The Bismarck Tribune|date= 19 Jan 1980 ==Notable works==