NORMAN, Okla. (AP) - Bob Stoops has decided to retire as Oklahoma's football coach after 18 seasons that included the 2000 national championship and 10 Big 12 Conference titles.

Stoops says the time is right to conclude his run in charge of the Sooners. The 56-year-old Stoops is a sure bet for the Hall of Fame.

Oklahoma says 33-year-old offensive coordinator Lincoln Riley is being promoted to head coach, making him the youngest head coach in the Bowl Subdivision.

Stoops was the longest-tenured active coach in major college football. In 18 seasons with the Sooners, Stoops was 190-48.

Texas A&M head coach Kevin Sumlin, an assistant under Stoops at OU from 2003-2007, released this statement in regards to Stoops:

“Bob is a tremendous mentor to so many players and coaches, including myself. Not only is he a great mentor to me, but he and his wife, Carol, have been great friends to Char and I for many years. His success and longevity speak for themselves. He will be a success in whatever he pursues. We wish Bob and his family the very best.”