*Elmer V. McCollum (1917–1944)
*Roger M. Herriott (1948–1975)
*Lawrence Grossman (1975–1990)
*Roger McMacken (1990–2008)
*Barry Zirkin (2008) Interim
*Pierre A. Coulombe (2008–2017)
*Michael Matunis (2017–2019) Interim
*Ashani Weeraratna (2019–present)