St Mary's School
Christian, Founded 1994
Updated July 2026
St. Mary’s School is an independent International Baccalaureate (IB) school in Aliso Viejo, California, serving students from Early Education through Grade 8. It is the only independent IB school in Orange County offering both Primary and Middle Years Programmes.
Teaching approach
Rooted in Episcopal values, the school is guided by the mission of "World-Sized Hearts. World-Class Minds." The educational approach emphasizes a whole-child philosophy that integrates intellectual rigor with social-emotional learning, character development, and service. The school promotes values such as curiosity, kindness, understanding, accountability, and generosity, aiming to develop students who are globally-minded and inspired to design solutions for real-world challenges.
Programmes
The school follows the International Baccalaureate (IB) framework, specifically the Primary Years Programme (PYP) and the Middle Years Programme (MYP), integrated with Design Thinking pedagogy. The academic program spans from Early Preschool through Grade 8, covering subjects such as language and literature, mathematics, science, individuals and societies, world languages (including Spanish, French, and Mandarin), and the arts. The curriculum is designed to be inquiry-based, encouraging students to ask questions and connect classroom learning to the real world.
Outcomes
St. Mary’s graduates are prepared to be globally-minded leaders and empathetic problem-solvers. The school’s alumni have gone on to pursue higher education at various universities and careers in fields such as education and nursing, demonstrating the impact of the school's inquiry-based learning and focus on character development. Students are recognized for their commitment to growth and leadership through honors such as the Father Ernest D. Sillers Legacy Award.
Student support
Learning support
The school provides a Center for Learning (C4L) to support student development. Additionally, the school employs school counselors who provide instruction in emotional regulation, mindfulness, and problem-solving, and utilizes an Advisory Program in Middle School to support the social, emotional, and academic needs of students through small, grade-specific groups.
Frequently asked questions(4)
- What curriculum does St Mary's School offer?
- St Mary's School offers IB PYP and IB MYP.
- What accreditations does St Mary's School hold?
- St Mary's School holds accreditations including IB.
- Is St Mary's School co-educational?
- St Mary's School is a co-ed school.
- Where is St Mary's School located?
- St Mary's School is an international school in Irvine, United States.
Tuition & fees
No published fee schedule was found for this school.
Admissions
St. Mary’s accepts applications for students from Early Education through Grade 8. The admission process requires families to submit an inquiry form to access the online portal, where they can track application components, register for information sessions, and submit required documentation. All students must provide proof of immunizations in accordance with age-based requirements. Financial aid is available for students in Early Kindergarten through Grade 8 and is awarded based on demonstrated need through a partnership with School and Student Services (SSS).
Calendar
The school operates on a traditional academic calendar, with summer breaks typically occurring in July. Information sessions for prospective families are held throughout the fall and winter months, with dates scheduled between October and January.
Facilities
About the campus
The 6.25-acre campus features several specialized facilities, including the Sillers Center, which houses the Thompson Family Early Education Center and a Design Center for hands-on learning. The campus also includes the Bhathal Merage Academic Center, the Bauer Arts Wing, the Purcell Family Science & Technology Wing, and the Green Family Commons gym. Outdoor spaces include the Floriani Family Park, Falcon Field, basketball courts, playgrounds, and the Sillers’ Seeds Garden. The IB Hub serves as a central library and research space, offering resources in multiple languages to support the school's global curriculum.
Co-curriculars
The school offers a variety of co-curricular activities designed to foster leadership and personal growth, including an Associated Student Body (ASB) for Middle School, a Student Ambassador program for Grade 5 and Middle School students, and various service learning projects. Athletics are a core component of student life, emphasizing hard work, healthy habits, and cooperation. Additionally, students participate in field studies, which provide experiential learning opportunities outside the classroom, such as visiting historical sites or engaging in environmental exploration.
- Doug PattersonHead of School
Doug Patterson serves as the Head of School at St. Mary's, where he oversees the institution's mission of fostering "World-Sized Hearts and World-Class Minds." He emphasizes the school's commitment to Episcopal values, inquiry-based learning, and the integration of the International Baccalaureate Programme with Design Thinking.
Jeannine ClarkeAssistant Principal, Lower SchoolJeannine Clarke serves as the Assistant Principal of the Lower School.
- Dustin MittelsteadtHead of Middle School
Dustin Mittelsteadt serves as the Head of Middle School.
- Shelly HarmonHead of Early Education
Shelly Harmon serves as the Head of Early Education.
- Jeff HaworthChief Financial Officer
Jeff Haworth serves as the Chief Financial Officer for the school.
- Abeni BiasDirector of Enrollment Management
Abeni Bias serves as the Director of Enrollment Management.
- Adrienne BononiDirector of Technology and Innovation
Adrienne Bononi serves as the Director of Technology and Innovation.
IB PYP