Student Life

Athletics - Staff & Resources



Athletic Director

Gary Bricker has been a member of the Trinity High School staff since 1993. Mr. Bricker has coached baseball, football and track and field and was assistant athletic director for 13 years prior to taking the lead as Athletic Director. Presently, he serves as President of the Mid Penn Conference and is chairperson of the sport of Cross Country for the conference.  In addition he officiates PIAA and NCAA track and field competitions.

B.S., Education – Millersville University

M.Ed., Education – NorthCentral University

Mr. LARRY KOSTELAC Jr. ‘76, P’01, 02, 06

Director of Athletic Advancement

In addition to being one of the most successful basketball coaches in the area, Larry Kostelac Jr. also works to further the athletic programming of the school as the Director of Athletic Advancement. Coach Kostelac has long been ingrained in the culture of Trinity: his father was Dean of Students for many years, he’s an alumnus, and his children attended the school. His devotion to Trinity extends to all students and all sporting programs at the school.


Assistance Athletic Director

Terrence Mull has been around Trinity High School athletics most of his life. As a Trinity graduate himself (2002), and the sibling of four Trinity graduates, the Trinity tradition in his family is longstanding. While a Trinity student, Mr. Mull played five sports and received a varsity letter in four. After graduating from Slippery Rock in 2009, he joined the Trinity staff as a teacher, coach, and assistant athletic director. Currently, Mr. Mull teaches health and physical education and coaches girls soccer and baseball, in addition to his Assistant Athletic Director duties. He also officiates soccer at the collegiate and professional level.

B.S., Sports Management, Misericordia University

B.S., Health & Physical Education, Slippery Rock University

M.Ed., Educational Leadership, Shippensburg University


Athletic Trainer

Stephanie Arnold joined Trinity’s staff as head Athletic Trainer in 2020, adding her work at Trinity to employment at Select Medical Physical Therapy. Ms. Arnold has experience working with concussions, and is certified in CPR/AED for Professional Rescuers and Health Care Providers, and in Emergency Management Institute Certifications. Her duties include providing quality athletic training service at home athletic events and away football games, coordinating rehabilitation for all student-athletes, and providing educational tools for injury prevention and awareness.

B.S., Athletic Training, Eastern University

Athletic Advancement


Create a legacy for yourself, your loved ones, your team or your class with an engraved brick placed in the walkway to Trinity’s COBO field. Bricks cost $50, and bricks engraved with a shamrock cost $100. By purchasing a brick, you give a lasting gift and help the school as well. The brick walkway helps to fund continued improvements on COBO Field.

Order your bricks here.


Promote your business and support Trinity with our Community Alliance. With opportunities to reach Trinity fans at the field, on the court, through social media, and in our newsletters to current families and alumni, our reach is wide! Join the program here.

Student Life

Athletics - Concussion Protocols

Trinity High School takes seriously the physical, emotional and academic consequences of concussions. We strongly encourage students who may have sustained a concussion to see a physician who specializes in treatment of concussions and head trauma and we work with those physicians to help students fully recover so that they may not only return to play, but fully access their academic course of study.

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