He was also a bishop of the African Orthodox Church, primate of the Order of Corporate Reunion, and president of Married Priests Now!—founded by excommunicated Roman Catholic archbishop Emmanuel Milingo.

[1][2][3] Brennan was born on November 1, 1941, in New York State; in his adulthood, he attended St. John's Atonement Seminary, which closed in 1967.

[6] In 2006, he was consecrated a bishop "sub conditione", with four other married priests including George Augustus Stallings, by Emmanuel Milingo—then Roman Catholic archbishop of Lusaka in Zambia.

"[9] This denial of canonical status meant that though Brennan had no authority to exercise any ministry in the Roman Catholic Church, he was still a valid bishop.

Brennan died on August 1, 2016, and was subsequently succeeded by Michael Kline and John Kersey as disputed primates of the Order of Corporate Reunion.