Colorado is losing another defensive coach to Oregon.
Cornerbacks coach Charles Clark is leaving the Buffaloes to join the coaching staff at Oregon, according to several reports and sources.
Clark will re-unite with Jim Leavitt, who left the Buffs on Dec. 14 after two years as defensive coordinator to take the same position at Oregon.
Hired by CU on Jan. 1, 2013, Clark spent four years coaching the Buffs' secondary, working with safeties in 2013 and 2014 and with cornerbacks the past two seasons.
This season, CU ranked sixth nationally in pass efficiency defense, as opposing quarterbacks had a rating of just 104.25 and completed only 49.8 percent of their passes.
Under Clark's tutelage, CU cornerbacks Chidobe Awuzie and Ahkello Witherspoon thrived, with Witherspoon having a breakout season in 2016. Safeties Tedric Thompson, Ryan Moeller and Afolabi Laguda also excelled during Clark's time with the Buffs, while young defensive backs Isaiah Oliver, Nick Fisher and Anthony Julmisse also show promise for the future.
Awuzie, Thompson and Witherspoon are all projected to be selected in the NFL draft this spring.
Up to this point, Clark, 32, has spent his entire coaching career working with CU head coach Mike MacIntyre.
Clark was a quality control intern at Duke in 2008 and then promoted to a defensive graduate assistant in 2009; MacIntyre was Duke's defensive coordinator in those years.
MacIntyre was the head coach at San Jose State from 2010-12, with Clark coaching the Spartans' defensive backs during that time. Clark then followed MacIntyre to Boulder in 2013.
Oregon, coming off a disappointing 4-8 season in which its defense ranked among the worst in the country, hired Willie Taggart as its new head coach last month. Taggart quickly tabbed Leavitt as defensive coordinator.