Marrinan was first certified in 2000 with his current recertification valid from 2010-20.
He has spent the last 28 years as a teacher with the past 23 years with Xenia Community Schools. Marrinan has served as a soccer coach for 26 years and has served as a department chairman. He helped establish the AP program and serves as an AP grader.
Since his initial certification, he has helped mentor teachers and National Board candidates. Marrinan currently teaches AP U.S. history and manages the Teaching American History Grant for Greene County schools.
He received his undergraduate degree in history/education (summa cum laude) and graduate degree in theology from the University of Dayton.
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