Assistant Principals

Dr. Jason Toncic

Work Experience: 
I’ve spent my career in New Jersey public schools, and I’m thrilled to be joining the Roxbury High School community. I began as a high school English teacher at Glen Rock High School, where I taught for eight years and advised the school’s student-run online newspaper. I then spent four years teaching English at James Caldwell High School before moving into administration as Supervisor of Humanities for New Brunswick Public Schools, where I worked alongside teachers across all grade levels to strengthen reading and writing instruction. Along the way, I’ve coached soccer and volleyball, advised a chess club, and taught future teachers as an adjunct professor at Montclair State University, where I also earned my PhD in Teacher Education.

Philosophy: 
I believe every student deserves to be known, challenged, and given real reasons to believe in what they can do. Schools work best when teachers feel supported in their craft, when families are true partners in the conversation, and when students are trusted with meaningful, difficult work.

Who I Am: 
I grew up in Edison, New Jersey, and attended Edison High School, where I spent my afternoons as goalkeeper and captain of the soccer team and an outside hitter on the boys’ volleyball team. I also loved to write, and I was a regular contributor to our literary magazine and a familiar face at our poetry slams. High school is also when I met a girl from our crosstown rival school named Jen, who is now my wife and teaches middle school science in Mount Arlington. We live in Rockaway with our three children, Cole, Kenzie, and Kaia, who have our hearts completely. Family has always been at the center of my life, and I couldn’t be happier to be joining this one at Roxbury High School.

Ms. Erin Posbergh

Work Experience:

The 2024-2025 school year will be my 14th year in education. I began my career in education in New York City, and I have taught all levels of high school physics throughout Central and Northern New Jersey prior to moving to California. In California, I taught physics and served as an Athletic Director at Oakland International High School. I am currently entering my 6th year as a building administrator. I served as a Vice Principal at Montgomery High School in Santa Rosa, CA, and most recently as a Vice Principal at Abraham Clark High School in Roselle, NJ. I am excited to be working at Roxbury High School this upcoming year! 

Philosophy:

I prioritize socioemotional learning alongside academic achievement. I strive to create a supportive environment for all stakeholders that values empathy, resilience, and self-awareness. I believe strong connections built on trust and respect are essential for effective teaching and learning. By meeting students’ diverse needs, I aim to foster a learning environment where every student feels understood and empowered. 

Who I Am:

Growing up on a farm in Somerset County, NJ, I have always loved working with animals and the outdoors. I graduated from Somerville High School and stayed local for college receiving two undergraduate degrees from Rowan University and a graduate degree from Seton Hall University. When I’m working, I’m often out hiking or training my dog in scentwork.