Our History

Crusader Alma Mater

Dedicated to Catholic values of dignity, humility, and compassion, our Crusaders stand for integrity, social awareness, and good judgement.

Under the banner of blue and gold, the Mater Dei Catholic Crusaders reach for academic excellence and always strive to be honest, trustworthy, spirited, and loyal. Crusaders seek truth and fight to protect the common good for all. Our Crusaders are dedicated to living the mission of Christ with pride for our individual heritage and school traditions.

Our Rich 60-Year History

Our students embody a love of God and neighbor.

Our story began 60 years ago when Marian High School was founded by Bishop Charles F. Buddy as the first co-ed Catholic high school in San Diego. Marian High School was located in Imperial Beach on a small campus donated by Emma and Robert Egger. Their generosity sparked a culture of giving at Marian that has inspired students to love, know, and serve God both on and off campus. In 1992, Marian High School changed its name to Marian Catholic High School.

We encourage and serve as a model to others by sharing the mission of Jesus in our world.

In 2007, Mater Dei Catholic High School opened its doors on a 48-acre campus. In 2015, Mater Dei Juan Diego Academy began with four grades (TK-2) and became the first Catholic dual-language immersion program in San Diego. In 2021, Mater Dei Catholic became the largest TK-12th grade Catholic school and second largest private school in San Diego.

Our Crusaders possess a generous heart and are committed to a spirit of service.

A bigger transformation began in 1995 when Estelle Kassebaum, affectionately known as Dr. K, joined as the new principal. With a vision to re-energize and restore the school, she forged a plan for Marian Catholic High School to move to a new, bigger, and more beautiful campus in East Chula Vista.

In 2007, the school was renamed Mater Dei Catholic High School, signifying the elevation of “Marian” to becoming the “Mother of God.” Despite the name change, the Crusader mascot, spirit, and tradition remain an integral part of this private Catholic school. Our students embody a love of God and neighbor.