Before Nebraska (Waverly-Shell Rock HS)
Mosai Newsom helped Waverly-Shell Rock High School to three consecutive state playoff appearances. Newsom was just the second Nebraska scholarship signee from the state of Iowa since 2008.
In his senior season, Newsom was an all-state selection after totaling 18 tackles, including 10 tackles for loss and 7.5 sacks to help his team to an 8-2 record and a state playoff appearance. On offense, Newsom had five receptions for 86 yards and a touchdown. Newsom also starred on both sides of the ball for Coach Mark Hubbard in 2017, helping Waverly-Shell Rock to an 8-2 record. Newsom played offensive line to help power an explosive offense, while making 38.5 tackles, 8.5 tackles for loss and three sacks on defense. Newsom first saw varsity action as a sophomore, helping his team to a state playoff appearance.
Newsom also helped the Waverly-Shell Rock basketball team to the state tournament as both a sophomore and junior and earned honorable-mention all-conference recognition as a junior. In track, he qualified for the state meet in the discus each of his final three seasons, finishing seventh in 2018. He had a school-record throw of 169-1 to qualify for the Drake Relays. In the shot put, Newsom finished second at the 2019 state meet with a personal-best throw of 52-6.
Newsom was ranked among the top five players in Iowa by both Rivals and 247Sports. He was also ranked among the top 40 strongside defensive ends by 247Sports. Newsom had numerous offers, including Iowa, Michigan State, Minnesota and Northwestern.