Br. Brendan was born Richard Henry Erwin to his mother, Helen E. Monahan, and his father, John Edward Erwin, on September 29, 1910 in New Britain, Connecticut. He attended St. Mary's School in New Britain until 1924, when he entered St. Joseph's Normal Institute. Br. Brendan entered the novitiate in July 1927 and took his first vows two months later. He continued to attened the Scholasticate in Pocantico until 1930, and then went on to Catholic University from 1930 to 1932. Br. Brendan attended graduate school at the University of Detroit from 1935 to 1938, John Carroll in Cleveland in 1950, New York University in 1949, Columbia University, and Boston College in 1961.
Throughout his career, Br. Brendan was assigned to a variety of positions. At St. Thomas Apostle in New York he taught 7th grade in 1932. A year later, he was teaching Latin, Geology, Physics, and English at St. Joseph's in Detroit. At the same St. Joseph's, Br. Brendan was named sub-director in 1939 and began to teach History, Economics, and Common Law. Br. Brendan moved to New York in 1945 where he taught all classes at De La Salle, until 1951 when he transferred to St. Augustine's in Brooklyn to teach English, Religion, and Geometry.
In the later half of his career, Br. Brendan was appointed the sub-director of Bishop Bradley in Manchester in 1961. In 1964, he was appointed vocation director at the Christian Brothers Novitiate in Narragansett. His final assignment, starting in 1967, was at St. Raphael's in Pawtucket, first as sub-director until 1975, and then as English and American Literature teacher until 1978.
Br. Brendan passed on July 17, 1981