College: Rosenmeier played outside hitter at Hawai'i. As a freshman he saw action in 19 matches as a backup, then became a starter during his sophomore season. He was third on the team in kills (2.10 per set) and had 13 kills, nine digs and six blocks in his NCAA Tournament debut. He again was third in kills (2.01 per set) as a junior, while ranking second in both aces (23) and reception percentage (.940). Rosenmeier ended his senior season with career totals of 397 kills, 289 digs, and 61 aces.

Personal: Rosenmeier was a Volleyball Magazine Fab 50 selection in high school, and was considered the number three recruit nationally in 2015. His high school team won two state championships and was runner-up twice during his career.