1848-1867 Four principals of the Allentown Seminary, President of the Allentown Collegiate and Military Institute and a President of the Allentown Collegiate Institute.
1867-1876 Frederick Augustus Muhlenberg
1877-1885 J.P. Benjamin Sadtler
1886-1903 Theodore Lorenzo Seip
1903-1904 William Wackernagel (acting)
1904-1936 John A.W. Haas
1936-1937 Robert C. Horn (acting)
1937-1951 Levering Tyson
1951-1952 Quintity (five-man acting committee)
1952-1953 Morris S. Greth (acting)
1953-1961 J. Conrad Seegers
1961-1969 Erling N. Jensen
1969-1984 John H. Morey
1984-1992 Jonathan C. Messerli
1992-2002 Arthur R. Taylor
2002-2003 James B. Steffy (acting)
2003 -       Peyton Randolph Helm