Mark J. Terrill/Associated Press
Lynn Swann, the athletic director at the University of Southern California since 2016, abruptly resigned on Monday amid turbulence in the football program, two F.B.I. investigations targeting the athletic department and questions about whether Swann’s connections to the school’s biggest donor had landed him the job, for which he had no previous experience.
Swann’s resignation was announced by the new university president, Carol L. Folt, who said that while U.S.C. conducts a nationwide search for a replacement, the job would be filled on an interim basis by Dave Roberts, a university administrator who is also the vice chairman of the N.