[2][3] As a true freshman, Bertrand played exclusively on special teams in four games.

In his junior season, he started in all 13 games and recorded 101 tackles, leading the Irish defense.

[1] He was named a team captain for the 2022 season and finished the year with a team-leading 82 tackles.

[6][7] Bertrand has two older brothers, Chris and John Michael, the latter of whom plays baseball in the San Francisco Giants organization.

Their great-grandfather, Cecil Muellerleile, played football, coached, and served as the athletic director at Saint Louis University.