William D. Hartman was born September 31, 1873, in Ridgefield, Illinois. He graduated from the University of Minnesota and was employed in Minneapolis before moving to Valley City, North Dakota. He is listed as a photographer in Cooperstown in 1906 and 1912. He was a teacher at the Valley City State Teachers College.
On May 12, 1914, in Brainerd, Minnesota, William married Josie C. Arneson, and they moved to Fargo. With Josie they adopted a daughter Patricia. William worked as a salesman for the Eastman Kodak Company for 35 years. In about 1922, William and Josie probably took over the New Garden Studio at 619 1st Avenue North, from Charles E. Reed. In about 1934 the studio was sold to Clifton L. Voss.
William retired from the Eastman Kodak Company in 1947. He died in Valley City on July 13, 1948. Mrs. Hartman died at her daughter’s home in Marion, North Carolina on October 6, 1957.