Washington went 7-5 during the regular season and 4-5 in conference play.
Jimmy Lake, who has been co-defensive coordinator alongside Pete Kwiatkowski, will take over as the head coach of the Huskies.
Petersen will step into an advisory role, UW Director of Athletics Jennifer Cohen said. His career record of 146-38 includes eight seasons at Boise State, where he famously led the Broncos to a pair of Fiesta Bowl victories and four top-10 finishes in the AP poll.
"I could not be more excited about taking over as head football coach at the University of Washington", Lake said in a statement.
"It has been a privilege and a professional dream fulfilled to be part of this world-class institution", Petersen said in the press release. I thank each of them, as well as our coaches and administrative staff for the incredible commitment they've made to Husky football during my tenure.
If Lake were to leave for another coaching job in college or professional football on or before January 31, 2022, he would owe Washington $6 million. His career winning percentage of.793 ranks second among active coaches with at least five years of FBS experience, according to Washington. He reached 100 career wins in 117 games, fifth-fastest in major college football history.
After a historically wonderful run at Boise State - going 92-12 with five conference championships and four top ten finishes in his eight years, he took over a Washington program that lost Steve Sarkisian to USC, remodeled and reworked it a bit, and then ... boom. When he did finally leave after posting a remarkable 92-12 record, it wasn't for a USC or a Tennessee but rather Washington, a then-irrelevant program nationally that just seemed to fit him better.
Washington was expected to be a contender in the Pac-12 again this year, but struggles to replace the loss of several key players on defense and an inconsistent offense led to a subpar campaign. Lake's secondary was key in that success, as evidenced by the long list of defensive backs who have gone on to success in professional football.
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Before landing on Petersen's Boise State staff, Lake had stints as a defensive backs coach with the Tampa Bay Buccaneers and Detroit Lions. I had personally thought Lake was going to be groomed to take over as the next Seahawk coach; he's that good. "He has an extraordinary way of relating to our student-athletes, is a gifted teacher of the game, and has a vision for what will make this program successful".