1940
Brown, Clyde V.
1940s
Freeman, John
1970s
Knoedler, Bob
circa 1963
1930s
1960s
Korling, Torkel
March 23 1964
1980s
1989
Irving, Gary
March 21 – June 20 1981
March 21 – June 20 1991
Doty, Carol L.
December 21 1991 – March 20 1992
January 25 1978
February 1 1978
1982 – 1986
1935
August 17 2015
The Morton Arboretum
1955 – 1956
April 1993
Nachel, Jim
November 29 2017
Brown, Deborah J. G.
August 31 1955
Godshalk, Clarence E.
September 13 1955
September 16 1955