John Atherton
September 25, 1943
Robert Riggs
May 1, 1944
Stevan Dohanos
October 21, 1944
Peter Helck
May 1, 1945
Matt Clark
October 1, 1945
July 1, 1946
September 1, 1946
Francis Chase
May 1, 1947
Mead Schaeffer
October 9, 1948
July 1, 1950
Pleisner
George Bingham
August 1, 1950
September 1, 1950
Andrew Wyeth
October 1, 1950
Wehr
May 1, 1953
Robert Addison
June 1, 1953
