Br. John (Damian) McMahon (Xaverian Brothers) – Diocese of Brooklyn

Brother John (Damian) McMahon  

Diocese of Brooklyn

Joined: 1943

Died: 2015

Assigned as follows:

  • 1943-1945      Unknown
  • 1946-1947      St. Francis de Sales High School (Utica, NY) 
  • 1948-1951      St. Matthew’s School (Brooklyn, NY)
  • 1951-1952      1952 Working Boys’ Home (Newton Highlands, MA)
  • 1952-1957      St. Francis de Sales High School (Utica, NY)
  • 1957-1965      Mt. St. Joseph High School (Baltimore, MD)
  • 1965-1974      St. Xavier High School (Louisville, KY)
  • 1974-1978      Tampa Catholic High School (Tampa, FL)
  • 1978-1983      Ryken High School (Leonardtown, MD)
  • 1983-1984      St. Joseph Regional High School (Montvale, NJ)
  • 1984-1987      Don Bosco College (Newton, NJ)
  • 1987-1988      Xaverian High School (Brooklyn, NY)
  • 1988-1990      Nazareth High School (Brooklyn, NY) 
  • 1990-1991      Retired (Brooklyn, NY)
  • 1991-2014      Unknown

Summary of Abuse Allegations against Brother John (Damian) McMahon:

Brother John (Damian) McMahon was a member of the Brothers of St. Francis Xavier. According to media reports, in 2019, his name appeared publicly on the Xaverian Brothers’ list of clergy credibly accused of sexual abuse of minors. It noted that in 2010, an allegation that Brother McMahon sexually abused a minor in the late 1980s was reported. 

In 1991, Brother McMahon retired. In 2010, he was placed on a “Safety Plan, restricted from interactions with minors and supervised.” Br. McMahon’s status as a brother, whereabouts, and whether he had access to children from 1990 until his death in 2015 are unknown.

In July 2019, Brother McMahon’s name first appeared publicly on the Archdiocese of Baltimore’s list of clergy credibly accused of sex abuse of minors. He was assigned to Mt. St. Joseph High School from 1957 through 1965.

Horowitz Law is a law firm representing victims and survivors of sexual abuse by Catholic priests and other clergy in the Diocese of Brooklyn.  If you need a lawyer because you were sexually abused by a priest in Brooklyn, contact our office today. Although many years have passed, those abused by Catholic clergy in the Diocese of Brooklyn now have legal options to recover damages due to a compensation fund created for victims.  Call us at (888) 283-9922 or send an email to to discuss your options today.