Trinity High School is helmed by an administrative team consisting of the President, Principal, Vice Principal/Director of Activities, Vice Principal/Director of the House System, and Vice Principal/Director of Students. Trinity is a diocesan school and enjoys the support and guidance of the Diocese of Harrisburg. Trinity also benefits from an active Board of Directors, composed of local pastors and laypersons. The House System also provides additional layers of both adult and student leadership. Each of Trinity’s four Houses is led by a faculty member and student-leader team.
Mr. John Cominsky graduated from Trinity in 1985 as class valedictorian. He graduated from Mount St. Mary’s University with a degree in theology. Later he earned his Master of Arts in Religion from Gettysburg Lutheran Theological Seminary. Mr. Cominsky has spent his career in Catholic education. He taught history and theology for 17 years at Trinity, served as Principal at Saint Joseph School, Mechanicsburg, and taught theology courses at Mount St. Mary’s. He returned to Trinity as the school’s first alumnus principal in 2016 and began his tenure as first president of the school in 2024.Â
Ms. Eileen Poplaski earned a degree in Government and Politics from the University of Maryland before working in government relations in Washington, D.C. Returning to Pennsylvania, she earned an M.A. in History and a Social Studies certification from Shippensburg University. She also completed coursework at Marywood University in school administration. She taught for 13 years at her alma mater, Bishop McDevitt High School, where she also served as Social Studies Department Chair before coming to Trinity as Vice Principal and Director of Studies in 2005. She began her role as principal of Trinity in 2024, with the transition to the president-principal model.
Mr. Marc Silvetti has a degree in art education from Kutztown University, as well as a Master of Educational Leadership from California University of Pennsylvania. He has experience in directing and building educational programs in a variety of schools, including River Rock Academy, Helen Thackston Charter School, and Compass Academy School. He joined Trinity’s administrative team in 2021.
Mrs. Trish Bolster grew up in Boston and earned a B.A. from Providence College, followed by her M.S. in Education from McDaniel College. Mostly recently, she earned a degree in Catholic theology from Avila Institute and Principal Certification. Before coming to Trinity, Mrs. Bolster worked in the Archdiocese of Washington, D.C., taught reading and study skills for private schools across the United States and abroad, worked as a social worker, and served as an academic advisor for Eastern University.Â
Mike Manning’s expertise with a former builder has made him an invaluable asset to Trinity High School as we achieve the goals set forth in the Faith in Our Future Capital Campaign and improve our physical plant. Mr. Manning’s more than 20-years affiliation with Trinity, his deep faith, and his love of the school have made him a natural leader of Trinity’s Board of Directors.
After decades of involvement with Trinity, including as an alumnus, parent, volunteer, and former president of the Trinity Athletic Association, Joe Centurione now serves on the Board with an eye toward the needs and strengths of Trinity. His work for the State of Pennsylvania, including experience with project management, information technology, and strategic planning, contributes to managing Trinity’s future.
Mrs. Michele Stager joined Trinity’s English Department in 2011, after first earning a degree in English from Penn State and working in the corporate world. She helped introduce the House System to Trinity in 2019 and served as the first dean of Seton House. In 2021, she stepped into the role of Director of the House System. She provides oversight and guidance to the separately operating Houses, and she works with students directly, including the two school captains. Mrs. Stager joined the administrative team in 2025.
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Phone: 717.761.1116
Fax: 717.761.7309
Email:Â communications@thsrocks.us
