Student Life

Athletics - Staff & Resources



Athletic Director

A Trinity employee since 2004, Alanna Stuart has taught physical education and health, coached, served as associate athletic director, and now leads the athletic department as athletic director. She received her undergraduate degree from East Stroudsburg University where she was a walk-on member of the Women’s Lacrosse team, and served on the NCAA Student-Athlete Advisory Committee.  She went on to earn her masters in Athletic Administration from Northcentral University. Ms. Stuart is pursuing her Ph.D. in Sports Management.

B.S., Exercise Science, East Stroudsburg University

M.Ed., Athletic Administration, 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.


Associate 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


Director of Strength and Conditioning

Justin Assadinia works with all our student-athletes, helping them to develop safe and effective strength and conditioning habits. His work with our students makes them stronger and better athletes, while also helping them to prevent injuries while training and competing. The knowledge and habits that students develop through their work with Justin will serve them throughout their lives. Justin has a degree in kinesiology from Penn State and excelled in Division 1 Rugby while earning his degree.


Athletic Trainer

Dan Resavy ‘12 joined Trinity’s staff as Head Athletic Trainer in 2022. He has experience working as an Assistant Athletic Trainer at Gettysburg College and Warner University. Mr. Resavy is certified in blood flow restriction, HawkGrips Level I, First Aid CPR, AED, and mental health first aid.
At Trinity, Mr. Resavy’s serves students by 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., Biology with a concentration in Pre-Health Services, Mount Aloysius College
M.S. Athletic Training, University of South Florida

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.

Connect With Us