+1 (973) 423-3331
(973) 423-3331 x220
Room 135, Y Building

Gary Olsen

Math Department Chair
Math Teacher


Mr. Olsen began his teaching career at Hawthorne Christian Academy, starting in 1992. He has taught mathematics, science, business, technology, and Bible. He has the New Jersey teacher certification and the Association of Christian Schools International certification in mathematics, secondary education.

Mr. Olsen has been involved in curriculum development and instructional leadership with HCA for over fifteen years. He has been the senior class advisor for over ten years. He has been a member of the National Council of Teachers of Mathematics for over twenty years. For a few years in the early 2000’s, he was an adjunct professor at Nyack College, teaching in the area of mathematics education.

Mr. Olsen enjoys playing tennis and doing ministry with the Christian education department at his church.


  • BS Mathematics – Wheaton College
  • MS Mathematics & Education – Montclair State University