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Mary Douglas Glasspool was born February 23, 1954 in Staten Island, New York, to Douglas Murray Glasspool and Anne Dickinson, while her father was the Rector of St. Simon's Episcopal Church and Vicar of All Saints' Church in New York City. That same year the family moved to Goshen, New York, where her father an ordained Episcopal priest served as Rector of St. James’ Church until his death in 1989.
The future priest was the child of a priest. Her father was the Rector of St. Simon's Episcopal Church and Vicar of All Saints' Church in New York City when she was born on February 23, 1954. Two months later he was appointed Rector at St. James' Church in Goshen, New York and continued to serve there until his death in 1989.
She enrolled at Dickinson College in Carlisle, Pennsylvania in 1972 where she excelled academically and graduated magna cum laude with honors in music in 1976. She also received the college's prestigious Hofstader Prize, awarded annually to recognize the outstanding woman in the graduating class.
While at Dickinson, she grapple with two important personal questions that would shape her future, her sexual orientation and the work she would devote her life.
At the time, the Episcopal church was not as welcoming to gays and lesbians, and the ordination of women, gay or straight, was still very controversial in the church.
Glasspool recognized she was a lesbian and acknowledge her desire to enter the family business of the priesthood.
She informed her father of her determination to become a priest.
The Reverend Douglas Glasspool was conservative, opposing to the ordination of women and wouldn't even let girls serve as acolytes at his church, but he gave his daughter his blessing to pursue her calling.
"I was an exception to his rules, not an example of the rule itself. That's how he was able to live with it. In his own gracious way, he sort of separated out public and private," stated Glasspool to Lisa Miller of Newsweek, adding, "I think he honestly was proud of me on a personal level and wanted to support me but couldn't break out of the kind of characteristics he himself promoted as someone who upheld the Tradition."
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While still in the seminary, she attended the General Convention of the Episcopal Church and signed up to be one of the people giving short presentations before the subcommittee on resolutions regarding sexuality, including whether there should be barriers to the ordination of homosexuals.
She made the point that when talking about human sexuality, one was not talking about "issues" but about people. She concluded her remarks by saying, "I trust that God's love at this Convention will transcend the issues and address the people--all of us--in our wholeness. I trust and pray that that same love will prevent any of us from condemning others--particularly, in this case, homosexuals--in our human, and full, and loving wholeness."
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In 1981, she became the assistant to the rector at St. Paul’s Church in Chestnut Hill, Philadelphia, where she served until 1984. She went on to be the rector of St. Luke's and St. Margaret's Church in Boston from 1984 to 1992, then the rector of St. Margaret’s Episcopal Church, Annapolis, MD from 1992 to 2001.
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Glasspool was on the committee in charge of arranging security for Harris's consecration. Precautions included outfitting Harris with a bullet-proof vest to wear under ecclesiastical robes at the ceremony, the same measure that would be taken at the installation of V. Gene Robison, the first openly gay man to become a bishop, in 2003.
Glasspool left Boston to become the Rector of St. Margaret's Episcopal Church in Annapolis, Maryland in 1992. The suburban parish was considerably larger and better funded than the one she served in Massachusetts.
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Her election gained worldwide attention as part of the ongoing debate about gay bishops in the Anglican Church.