 He was a scout for five years prior to assuming the head coaching position at organization's Lowell Devils AHL affiliate from 2006–07 to 2008–09.On July 13, 2009, it was announced that former Devils star John MacLean would replace Kleinendorst as the head coach of Lowell.Kleinendorst was named head coach of USA Hockey National Team Development Program's Under-18 team for the 2010 season, leading the team to a Gold Medal at the 2010 IIHF World U18 Championships.