text: *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)