About MD
Mater Dei is a distinguished destination of excellence in academics and technology, the arts, faith and service, campus life, and athletics. We are proud to be Orange County’s oldest and largest Catholic high school.
Admissions
Your journey to becoming a Monarch starts here! Tour campus, schedule a shadow day, begin your application, and more. We are excited for you to join the MD family!
Programs
Built on Catholic fellowship and intellectual rigor, our programs in academics, technology, athletics, faith and service, and the arts provide unlimited opportunities for student success. Comprehensive counseling and wellness resources educate and bolster families throughout the high school journey.
Faith in Action
Guided by the articulation of Catholic Social Teachings, Mater Dei prioritizes the faith development of our students with an emphasis on Christian service. We believe this allows our students to grow in their spiritual lives while living our gospel values through giving back to others and truly experiencing the face of God.
Campus Life
Through avenues of leadership, faith, shared interests, and extracurricular activities and events, students can make Mater Dei their own. Get involved today!
Community
Tradition never graduates. Alumni, lifetime parents, grandparents, and friends are a vital and vibrant aspect of our community. Once a Monarch, always a Monarch.
Giving
Behind every achievement, success, and championship, stand the alumni, parents, faculty, staff, and friends who fortify our future. We invite you to support MD in a variety of ways with a gift that is meaningful to you.
- Students
- Parents
- Faculty

Biography

About:

I currently teach Algebra 2/Trig And Honors Algebra 2/Trig. It has been a privilege to work in a Catholic school since 1985 where I can visit Jesus any time of the day by simply walking over to the chapel. Life can't get any better than that. God has been very generous to my wife and me by giving us the gift of six children to which the Mater Dei community has always been very kind. My colleagues are the best.

Education: Master's

Master of Science - Northern Arizona University; Bachelor of Science - University of Southern California; Single Subject Teaching Credential - University of California Irvine

Teaching Since: 1985

Teaching at MD since: 1985

Name: Mr. Sean Lieblang
Position: Math Teacher
Email: Send email