Catherine McMullen is the Chief of the Disclosure Unit at the U.S. Office of Special Counsel, a position she has held since 1995. Ms. McMullen manages the whistleblower disclosure program at OSC including the review of allegations received from federal employees, former federal employees and applicants for federal employment, as well as the oversight of the Special Counsel's requests for investigation pursuant to 5 U.S.C. § 1213.

Ms. McMullen joined the U.S. Office of Special Counsel’s Prosecution Division in 1987. During her tenure in the Prosecution Division, she was detailed to the U.S. Attorney’s Office as a Special Assistant United States Attorney for the District of Columbia. Prior to her OSC employment, she was employed in the Litigation Division at the U.S. Maritime Administration. She also served as an Assistant Attorney General for the State of West Virginia and an Assistant Prosecuting Attorney.

Ms. McMullen received both her J.D. and B.A. in Political Science from West Virginia University. She is a member of the State Bar of West Virginia.