I James Zilliox (1885 – 1886)
II Hilary Pfraengle (1886 – 1909)
III Ernest Helmstetter (1910 – 1937)
IV Patrick O’Brien (1937 – 1967)
V Martin Burne (1966 [coadjutor] – 1971)
VI Leonard Cassell (1971 – 1975)
VII Brian Clarke (1975 – 1995)
VIII Gerard Lair (1995 – 1998)
IX Thomas Confroy (1998 – 2006)
X Giles Hayes (2006 - 2014)
XI Richard Cronin (2014 - present)

Priors of St. Mary's Abbey

St. Mary’s Priory, Newark, Dependent on St. Vincent Archabbey, Latrobe, PA
Valentine Felder (1857)
Rupert Seidenbusch (1857 – 1862)
Utho Huber (1862 – 1863)
Oswald Moosmueller (1863 – 1866)
Roman Hell [Heil] (1866 – 1871)
Bernardine Dolweck (1871 - 1871)
Leonard Mayer (1871 - 1875)
Bernard Manser (1875 – 1880)
William Walter (1880 - 1882)
Gerard Pilz (1882 – 1884)

After elevation of St. Mary's Priory to independence as St. Mary's Abbey (1884)
Cornelius Eckel (1885 - 1886)
Ambrose Huebner (1886 – 1888)
Augustine Wirth (1888 - 1889)
Ernest Helmstetter (1889 - 1910)
Polycarp Scherer (1910 - 1924)
Anselm Kienle (1924 - 1937)
Boniface Reger (1940 - 1944)
Charles Carroll (1944 – 1946)
Matthew Hoehn (1946 - 1958)

Priors at Delbarton

Before 1956 (transfer of the abbatial title to Morristown)
Edward Bill (1926)
Henry Becker (1927 - 1931)
Vincent Amberg (1931 – 1945) 
Hugh Duffy (1945 - 1952)
Bede Babo (1952 - 1956)

After 1956 transfer of the abbatial title to Morristown)
Michael Collins (1956 – 1967)
James O’Donnell (1968 - 1972)
Brian Clarke (1972 – 1975)
Beatus Lucey (1975 - 1980)
Cornelius Sweeney (1980- 1993)
Richard Cronin (1993 - 1995; 2006 - 2009)
Elias Lorenzo (1995 - 2002)
Patrick Hurley (2002 - 2004)
Paul Diveny (2004 - 2006)
Bruno Ugliano (2009 - 2013)
Jerome Borski (2013 - 2018)
Edward Seton Fittin (2018 - Present)

(between transfer of title and independence)
Matthew Hoehn (1956 - 1958)
Martin Burne (1958 - 1960)
George Sherry (1960)

Subpriors of St. Mary's Abbey

In Newark
Ephrem Hetzinger  (1910)
Boniface Reger (1924 – 1937)
Benedict Bradley (1941 – 1945)
Gregory Schramm (1946 – 1949)
Michael Collins (1949 – 1956)
 
In Morristown
Stephen Findlay (1952 – 1970)
Simon Gallagher (1970 – 1972)
Germain Fritz  (1972 – 1973)
Alfred Meister (1973 – 1974)
Beatus Lucey (1974 – 1975)
Cornelius Sweeney (1975 – 1980)
Andrew Smith (1980 – 1981)
Mark Confroy (1981 – 1989)
Hilary O’Leary (1989 – 1992)
Paul Diveny (1995 – 1998)
James O’Donnell (1998 – 2000)
Patrick Hurley (2000 – 2002)
Rembert Reilly (2002 – 2009)
Eamon Drew (2009)
Luke Travers (2009)
Rembert Reilly (2009 – 2013)
Andrew Smith (2013 – 2017)
John Hesketh (2017 - Present)
 
Masters of Novices
Claude Micik (1938 – 1939; first Novice Master in history of SMA)
Martin Burne (1965 – 1966)
Brian Clarke (1966 – 1972, 2001 – 2002)
Hilary O’Leary (1972 – 1982; 2007 – present)
James O’Donnell (1982 – 1992)
Giles Hayes (1992 – 1995)
Paul Diveny (1995 – 2001, 2002 – 2007)