After redshirting his first year at Iowa in 2013, Jewell played in 11 games and made four starts in 2014. He finished the season with 51 tackles and one sack. As a sophomore in 2015, he started all 14 games and led the team with 126 tackles, three sacks and four interceptions. As a junior in 2016, Jewell started all 13 games and again led the team with 124 tackles with 1.5 sacks. He was second-team All-Big Ten for the second straight season, and a finalist for the Butkus Award. As a senior in 2017, he won the Jack Lambert Award, was a finalist for the Bronko Nagurski Trophy, and was named the Big Ten Defensive Player of the Year after leading the Big Ten with 125 tackles.
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