Southern California athletic director Mike Bohn, citing “ongoing health challenges,” resigned Friday, effective immediately.

Bohn, 62, has been in charge of Trojans athletics since November 2019 and made a splashy hire in football coach Lincoln Riley as well as guiding the university’s pending move to the Big Ten Conference in 2024 with rival UCLA.

“After more than 40 years of college athletics leadership, it is the right time to step away from my position as Director of Athletics at the University of Southern California,” Bohn said in a statement to The Los Angeles Times. “I have dedicated my life to serving student-athletes and advancing the enterprise of intercollegiate athletics. I will always be proud of leading the program out of the most tumultuous times in the history of the profession and at USC with a restored reputation and national milestone accomplishments.”

In his statement Friday, Bohn said “… it is important now that I focus on being present with my treasured family, addressing ongoing health challenges, and reflecting on how I can be impactful in the future.”