After the season-opener against the Arizona Wildcats in 2007, Unga earned the Mountain West Conference offensive player of the week award. He had gained 194 all-purpose yards, with 127 yards coming from receptions. Unga became the starting running back in 2007 due to an injury to Fui Vakapuna in the prior season. As a starter, Harvey rushed for over 1,000 yards in just 11 games, with this mark reached in the second quarter against their in-state rivals, Utah, on November 24, 2007. He was named the MWC Freshman of the Year. He had the second-most yards gained by a freshman in MWC history, and third among all freshman running backs in the nation in 2007. In 2009, Unga rushed for 1,087 yards and 11 touchdowns, and became the school's all-time leading rusher with 3,455 yards. He earned first-team All-MWC honors following the season. On April 16, 2010, Unga voluntarily withdrew from BYU after violating its honor code.
Unga was selected by the Chicago Bears with a seventh round selection in the 2010 Supplemental Draft. He was signed to a four-year contract on July 21, 2010. On August 31, 2011 the Bears received a roster exemption for Unga, who had left the team twice during the preseason for personal reasons. He was placed on the reserve/left squad list on September 20, 2011. Following the 2011 season, Unga was reinstated to the active roster on April 16, 2012. On August 27, 2012, Unga was waived by the Bears. He was later placed on the practice squad. He was once again waived on October 9, and replaced by Kamar Aiken. On December 4, Unga was brought back to the Bears practice squad. On December 28, Unga was elevated to the active roster. On August 30, 2013, Unga was released. On September 1, Unga was re-signed to the Bears practice squad, However a month later, on October 1, Unga was once again released from the team.
Unga is currently serving as the running backs coach at BYU under head coachKalani Sitake. He was promoted to this position on March 19, 2020 after having worked as a graduate assistant and student assistant since 2015.
Personal life
Unga was born to Jackson and Theresa Unga. His father played running back for the BYU Cougars in the early 1980s. Since July 16, 2010, he is married to Keilani, a former BYU women's basketball player, and sister of former Chicago Bears tight endTony Moeaki. The couple has a son, Jackson, and a daughter, Leila.
