Andersen informed the Badgers at a team meeting at 4 p.m. on Wednesday. Wisconsin Director of Athletics Barry Alvarez has immediately started a national search for a new head football coach.
“First and foremost I want to thank coach Alvarez for the opportunity to coach at the University of Wisconsin,” Andersen said. “I also want to thank my staff and the people at UW. We worked very hard together and accomplished some great things. I had the opportunity to meet and coach some great young men and I look forward to watching them as they continue their careers and move through life.”
Andersen led Wisconsin to a 10-3 overall record in his one season as head coach. The Badgers will play the Auburn Tigers in the Outback Bowl on New Year's Day.
“Gary is a winner," Oregon State Director of Athletics Bob De Carolis said. "He is a man of integrity and substance. He has extensive West Coast ties and knows the landscape of the Pacific-12 Conference, having previously coached at Utah, a current conference member. He is part of the Urban Meyer coaching tree."
"We have hired the right coach," De Carolis added.
Alvarez said he's already begun the search for Andersen's replacement,
“My first concern is taking care of the players on the current team, especially the senior class, and ensuring that their bowl experience is a memorable one," Alvarez said. "I will find a head coach to uphold the great tradition at Wisconsin, someone who is committed to excellence both on and off the field.
“I want to thank Gary for his two years here and commend him on the way his team performed on the field, in the classroom and in the community. I wish him the best at Oregon State.”
During his stints at Wisconsin and Utah State, Andersen was 49-38 as a head coach. His teams also played in bowls each of the past four seasons.