$73.5 billion Marathon Oil Corp. has announced the retirement of William Schwind as vice president, general counsel, and secretary, effective Nov. 1. Schwind will continue in his current role until Sept. 1, when he will assume the position of senior vice president of law and secretary.

At that time, Sylvia Kerrigan will become vice president and general counsel. Following Schwind's retirement, Kerrigan will assume the additional responsibility of corporate secretary.

Kerrigan currently serves as Marathon's assistant general counsel for litigation, human resources, health, environmental, safety, and security law. She joined Marathon in 1995, and has been in her current position since 2001.