Denise Brennan

Denise J. Brennan was born on August 8, 1934 in Dublin, Ireland. Her parents’ names were Joseph and Ita (Ryan) Brennan, and she had 8 brothers and 2 sisters. While more information about her early life is unknown, those who knew her said that she came from a relatively eminent family in Dublin. As an adult, she became a Catholic priest and started working in the Albany, New York, Diocese circa 1967. She was known as “Father Dennis Brennan” and publicly identified as a male at this time, according to parishioners in the diocese. Brennan became the pastor of St. Margaret of Cortona Roman Catholic Church in Rotterdam Junction, New York, around 1984 and continued in that role for the next 16 years. Brennan became a revered member of the Rotterdam Junction community, performing baptisms and marriages, and was known for her talent at the piano. She was also known to have a “conservative” perspective on Catholicism and the priesthood, according to St. Margaret’s parishioners who knew Brennan. In reflecting on her time serving as a Catholic priest, Brennan wrote:

“I can never, adequately, express my profound gratitude for the privilege of sharing, through ordination, in our Lord’s priestly ministry…During 33 years of serving as a priest in the parishes of Albany, I have been lavished with our Father’s love through the kindness and generosity of countless faithful disciples of His Son” (Brennan, quoted in Dicker, 2000).

At the beginning of 2000, St. Margaret’s parishioners received a letter written by Brennan, describing her life-long struggle with gender dysphoria. The letter detailed that, while also seeking help multiple times in her life, Brennan once again reached out to a New York City doctor for assistance around 1997. After hiding her femininity for most of her life, she began living in line with her female identity full-time at the end of 1999. In the letter to St. Margaret’s, Brennan informed the parishioners that she changed her name legally to Denise and her gender designation to Female. There was controversy in the parish around the news of Brennan’s transition. Brennan writes that her family and friends, probably including some of her parishioners, were supportive of her decision. However, many parishioners spoke openly about their feelings of betrayal, shock, and aversion to Brennan’s news, resulting in the story being picked up in a sensationalized article in the New York Post (Brennan herself was not interviewed for this article). Furthermore, there are conflicting reports about the opinion and role of Diocese of Albany Bishop Howard Hubbard. Frederic Dicker, author of the New York Post article about Brennan, states that Bishop Howard publicly condemned Brennan’s decision. However, Dicker also claims that there might be evidence that Bishop Hubbard in fact supported Brennan’s transition, given that the Albany Catholic Diocese was known to be more “theologically liberal” (Dicker, 2000).

Little to no written evidence of the events of the remainder of Brennan’s life exist. She died “peacefully” on May 2, 2021 (“Denise J. Brennan Obituary”). At the time, she was living in Jupiter, Florida.

(This biographical profile written by Sarah Rodriguez from the sources below.)

Biography Date: October 2026

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