After 10 seasons coaching at the college level, Clapper joined the basketball coaching staff at
IMG Academy in 2015. This position has included being a coach for the post-graduate and varsity teams, delivering basketball camps, and offering skills instruction to players of all ages. A number of his players have been chosen in the
NBA draft. He was hired as the head coach of the
Penn State Altoona Lions on September 16, 2009. Clapper was relieved of his position on March 26, 2015, after six seasons as the head coach of the Lions, a member of the
Allegheny Mountain Collegiate Conference and an NCAA Division III institution. The Lions had a combined 38–112 record during his six seasons. The Lions had seven all-conference selections: Zach Spitz (2010), Kirk Peters (2010, 2011),Matt Gehret (2013), and Durant Harvin (2013). He coached the school's only all-region selection, Kirk Peters (2011), and one AMCC defensive player of the year, Matt Gehret (2013). In the spring of 2015, senior forward Joel Redfoot was honored by the National Association of Basketball Coaches as a member of its All State/NABC Good Works Team at the
NCAA Final Four in Indianapolis, Indiana. His coaching career began as an assistant at
Penn State Altoona under Alan Seretti in 2005–2006. The program had seven victories that season and the team was led by Tyler Franklin, the program's all-time scoring leader. During the 2006–2007 season, he was a member of the coaching staff at
Indiana State University under Coach
Royce Waltman. The Sycamores earned 13 victories on the season and had victories over three NCAA tournament participants:
Butler,
Creighton, and
Purdue. He joined the coaching staff of
Bob Rukavina at the
University of Pittsburgh at Johnstown prior to the 2008–2009 season and during the next two seasons he helped guide the Mountain Cats to a 47–16 record. They were crowned
WVIAC regular-season champions in 2008 and tournament champions in 2009. They advanced to the NCAA tournament during both seasons (2008 – second round and 2009 – first round). He coached two players that earned All-American honors– Chris Gilliam (2007) and Marcus Tullis (2008), whom went on to have professional basketball careers overseas. ==The Basketball Tournament==