Robert Loren Thoburn

Founder, Headmaster
OH since 1997

Robert and his wife, Sheila, belong to Reston Bible Church. In 1997 they founded OH and have seen 6 of their grown children graduate from the school. Their 3 youngest still attend. Robert earned a B.A. in business and Austrian economics at Grove City College and a J.D. from Pepperdine University School of Law.

Sheila Key Thoburn

OH Since 1997
IEW Registered Instructor
Sheila Key Thoburn was influential in creating a classical curriculum at Oak Hill over the years. She grew up in Arlington, studied biology and paramedics, and is a great mother to her and Robert’s children. She thoroughly enjoys reading almost any book and, when she can, runs her own Etsy Shop. She is also a registered instructor with the Institute for Excellence in Writing.

David Sabin

Enrollment Advisor
OH since 2016

David Sabin was born into a family of missionaries. He speaks fluent Spanish and participates in music ministry and prayer team at Grace Tabernacle Church in Ashburn. Mr. Sabin has 4 sons and holds a B.S. in English and Spanish Education and an M.A. in Administration from Pensacola Christian College.

Abigail Thoburn

Office Manager
OH since 2020

Abigail Faith Thoburn is our School Office Manager. She earned an A.A. in Liberal Arts and Culture from New Saint Andrews College. Abigail plays violin and loves boba milk tea.

Zachary Aardsma

Assistant Office Manager
OH since 2021

“Mr. Z” works as an upper school co-teacher and also teaches Calculus and Algebra. He pursues math and science, and he studied molecular biology at the University of California, Santa Cruz and Houghton College. He enjoys tennis, mountain biking, golf, pickleball, swimming, drawing, and painting. He and his wife attend Cornerstone Chapel, and they are expecting their first child in September.