[2][3] Due to his father Doug's career as a football coach, he moved 12 times growing up, living in eight different states and Canada, while spending summers in Lake Charles, his mother's hometown.

[3] Nussmeier attended Edward S. Marcus High School in Flower Mound, Texas where he passed 3,788 yards and 38 touchdowns in his junior season.

[9] Following the departure of Max Johnson from the team, LSU petitioned the NCAA to let him start the January 2022 edition of the Texas Bowl but still maintain his redshirt status, which was denied.

[12][13] Nussmeier entered seven games, all off the bench, throughout which he completed 62% of his passes: totaling 800 yards, five touchdowns, and four interceptions.

[14] He made his first start with the team in the 2024 ReliaQuest Bowl in January after Daniels sat out to prepare for the NFL draft, earning MVP honors after throwing for 395 yards and three touchdowns.