Harrell helped guide North Texas to the nation's No. 28 scoring offense in 2018.
USC hired North Texas' offensive coordinator Graham Harrell to the same position on Monday, according to The Athletic's Bruce Feldman.
Harrell spent three seasons as UNT's offensive coordinator from 2016-18. The Mean Green ranked No. 28 in the NCAA in scoring in 2018. Quarterback Mason Fine threw for 3,793 yards and 27 touchdowns.
Harrell played four seasons at Texas Tech from 2005-08. He tallied 15,793 passing yards and 134 touchdowns in 45 starts. Harrell threw for 5,000-plus yards and 45-plus touchdowns in both his junior and senior seasons.
USC went 5–7 in 2018, ranking No. 91 in the nation in scoring.