Mickelson will sit out the 2013-14 season, due to transfer rules and will have two years of eligibility beginning with the 2014-15 season.
"Hunter is a young man that we recruited out of high school, offered a scholarship and he chose to stay close to home," Kansas head Bill Self said in a statement. "He decided after two years at Arkansas that a change would do him good and we're very excited about the change. He fits how we play. He's long, very interchangeable and will be able to step away from the basket and stretch it. Defensively, he is a presence because he's a shot blocker."
With addition of Mickelson, the Jayhawks will still have two remaining scholarships for next season.
A native of Jonesboro, Ark. Mickelson averaged 5.5 points and 3.5 rebounds per game and led the Razorbacks with 39 blocked shots during the 2012-13 season.
He also set the school freshman record with 72 blocks in leading the Razorbacks with 2.3 blocks per game in 2011-12. That season, Mickelson averaged 5.2 points and 3.7 rebounds for the Razorbacks.
Self hopes next season can give him an opportunity to make a big impact at Kansas.
"I think the redshirt year will be great for him," Self said. "It will give him the opportunity to get stronger, get confidence and get his game to the point where he can be a serious impact player for us the following year."