Born Louis Endler in West Hoboken, New Jersey on June 5, 1892 he was the son of John Endler and Catherine Kline. He attended St. Michael’s Parochial School and then his family moved to Newark, New Jersey where he completed his high school education. He entered the Passionist novitiate at Pittsburgh, Pennsylvania and professed his vows on August 3, 1913 with the name Julian. He was ordained a priest at St. Joseph’s Monastery, Baltimore, Maryland on December 17, 1921 by Bishop Paul Nussbaum, C.P., who, in 1920, had resigned from the see of Corpus Christi, Texas due to ill health.
Father Endler served as Vice-Master of Novices from 1922 to 1923, Director of Students in Brighton, Massachusetts from 1923 to 1925. He then returned to be Vicar in Pittsburgh from 1925 to 1928.
In 1928 he was assigned to work with the new Passionist mission to Black Catholics at St. Joseph’s Mission in New Bern, North Carolina. He remained at this mission for thirty years. Living conditions and the conditions were deplorable. Slowly he developed the apostolate and was not deterred by the 1943 fire. His persistence to rebuild the area was a success because of the direct intervention President Franklin D. Roosevelt who waved war-time restrictions for the needed effort. In 1957 Father Endler suffered a stroke and died in 1959. His twin brother, Father John Joseph Endler, C.P., was also a Passionist.