Clackson attended Peters Township High School in McMurray, Pennsylvania, and played for the school's varsity ice hockey team, winning two Pennsylvania State AA Ice Hockey Championships.
high school | Harvard Business School | London School of Economics | Harvard Medical School | High Court | secondary school | Harvard Law School | Eastman School of Music | High Court of Justice | Juilliard School | Public school (government funded) | High School Musical | Gymnasium (school) | Yale Law School | Ultra high frequency | Rugby School | school district | high school football | High Court of Australia | public school | school | New York University School of Law | High-definition television | Westminster School | Tisch School of the Arts | Charterhouse School | Harrow School | University-preparatory school | Naval Postgraduate School | Glasgow School of Art |