Our church is sustained by ministers, musicians, staff, and elected lay leaders who share in the care and guidance of our community. Meet the people who support our worship, music, administration, historic building, and congregational life.
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Rev. Mark J.T. Caggiano, Minister
Rev. Mark is a graduate of Harvard College and Harvard Divinity School. He also received his Juris Doctor from Boston College Law School and his Doctor of Ministry from Boston University. Prior to the ministry, Mark was a lawyer in the Boston area working in real estate and commercial litigation. He also served for six years as a selectman in North Andover, Massachusetts. Rev. Mark is adjunct faculty at Boston College Law School, teaching courses on Election Law and the First Amendment/Church and State. He is author of Faith on Trial: Religion and the Law in the United States.
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Kathryn Rosenbach, Music Director
Kathryn is known for her performances as a pianist and organist, as well as choral conductor, composer and teacher. She has been a church music director for more than 40 years in various denominations. Kathryn graduated from SUNY Buffalo with a BFA and MFA, received an artist diploma from the Accademia di Chigiana in Siena, Italy and has pursued doctoral studies at the Eastman School of Music. She has always been involved with singers of all levels and loves to work with opera singers.
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Rev. Diego Garrido Barreto, Ministerial Intern & Church Administrator
Rev. Diego Garrido Barreto (1996) is a Colombian Unitarian Universalist minister, preacher, artist, and spiritual director. He holds a Master of Divinity from Boston University School of Theology and a Bachelor of Arts in Literature. Ordained in May 2026 by First Church in Chestnut Hill and First Parish in Brookline, he now serves as Assistant Minister and Church Administrator at First Church in Chestnut Hill, seeking preliminary fellowship. His ministry is shaped by Christian mysticism, liberation theology, justice, beauty, and multicultural spiritual care. His preaching received national recognition through the 2024 UU Climate Justice Revival sermon contest and the 2025 Hare Preaching Prize.
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Dana Flynn, Sexton
Dana Flynn has served as the church’s sexton since 2004. A graduate of Northeastern University and a retired Newton firefighter, Dana brings a steady, thoughtful approach to caring for the building and its daily needs. He and his wife, Rose, live in Newton, where they raised their three daughters. His consistent and dedicated work—quietly keeping the spaces clean, organized, and ready for the week’s activities—has supported the life of the church in countless practical ways. And though he prefers to keep to the work itself, those who cross paths with him know his steady interest in sports is never far from reach. The congregation holds a warm and genuine gratitude for his long years of service.
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As an independent church, the First Church in Chestnut Hill is governed by a Standing Committee composed of members elected each year from the congregation. Day-to-day operations of the Church are led by our minister, music director, and sexton.