School

Leadership

Trinity is helmed by an administrative team consisting of the Principal, Vice-Principal (Director of Academics), and Dean 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.

Administration

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Mr. JOHN COMINSKY ’85, P’15

Principal
jcominsky@thsrocks.us

Mr. John Cominsky graduated from Trinity after first converting to Catholicism under the influence of Trinity’s Immaculate Heart of Mary Sisters. He graduated from Mount St. Mary’s University with degrees in theology, history, philosophy, English, and communications. Later he earned his Masters in Theology from Gettysburg Lutheran Theological Seminary. Mr. Cominsky has spent his career in Catholic education. He taught history and religion 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. 

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Ms. EILEEN POPLASKI P’19

Vice Principal and Director of Studies
epoplaski@thsrocks.us

Ms. Eileen Poplaski earned a degree in Government and Politics from the University of Maryland before working in government relations in Washington, D.C. She returned to Pennsylvania where 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, where she also served as Social Studies Department Chair before coming to Trinity as Vice Principal and Director of Studies in 2005.  

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Mrs. TRISH BOLSTER P’25, 26 

Vice Principal and Director of Activities
pbolster@thsrocks.us

Mrs. Trish Bolster grew up in the Boston area and earned a B.A. from Providence College. She continued on to earn her M.S. in Education from Western Maryland College. Mostly recently, she earned a graduate degree in Catholic Theology from Avila Institute and a K-12 PA Principal Certification. Prior to relocating to Harrisburg, she taught at a Catholic high school in the Archdiocese of Washington, D.C.; reading and study skills at private schools all over the United States and abroad in the early 2000s. In addition to a career in education, she has experience as a social worker, an academic advisor in higher education (Eastern University), and a wine club coordinator.

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Mr. MARC SILVETTI P’21

Director of Students
msilvetti@thsrocks.us

Mr. Marc Silvetti has degree in art education from Kutztown University as well as a Masters Degree from California University of Pennsylvania in Educational Leadership. 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 administration team in 2021.

Board Of Directors

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Mr. MICHAEL MANNING P’99, 01, 03, 23, 26
President

Mike Manning’s expertise with construction and maintenance as owner of his own construction firm 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. Mike’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.

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Mr. JOSEPH CENTURIONE ’85, P’15, 19

Treasurer

After decades of involvement with Trinity, including as an alumnus, parent, volunteer, and 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.

Rev. DON BENDER
Mr. TODD CIRELLI P’20, 22
Mrs. MARY KAY DOMINGUEZ P’17, 19, 20
Mrs. KATIE FLAKE P’18, 21
Mr. TODD LONG ’87, P’17, 19, 22
Rev. NEIL SULLIVAN
Mrs. MARY CATHERINE SCOTT
P’14, 17, 20, 22
Mr. KEVIN SHOOK ’87
P’16, 17, 21, 23
Rev. KENNETH SMITH ’75

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