Christian J. Klossner

Christian J. Klossner is the Executive Director of the Office of Special Enforcement (OSE). He previously served for over five years as the deputy director of the District of Columbia's Office of Police Complaints (OPC), where he oversaw the agency's investigative, adjudication, mediation, outreach, and administrative activities. Prior to joining OPC, he worked as an assistant district attorney in the Office of the Special Narcotics Prosecutor of New York City and the Office of the Bronx District Attorney. He also served as an adjunct professor of trial advocacy at his alma mater, Fordham University School of Law. Before earning his J.D. from Fordham, Mr. Klossner worked as a campaign organizer, lobbyist, and staff supervisor with the New York Public Interest Research Group.

Francine Vlantes O'Keeffe

Francine Vlantes O'Keeffe is the Deputy Executive Director of the Office of Special Enforcement (OSE).  She previously served as Special Assistant Corporation Counsel for OSE, where she investigated and brought legal action to stop residential buildings from being used for illegal short-term rentals.  Prior to joining OSE, she served as a hearing officer with the Office of Administrative Trial and Hearings (OATH), where she presided over administrative adjudications of alleged violations of city laws and rules affecting public safety and health.  She also served as a federal judicial law clerk to the Honorable Freda L. Wolfson, now Chief Judge for the United States District Court, District of New Jersey.  Prior to entering public service, she was an associate at Lowenstein Sandler practicing white-collar criminal defense and business and class action litigation.  Ms. O'Keeffe received both her undergraduate and law degrees from Rutgers University.

Aron M. Zimmerman

Aron M. Zimmerman is the Legal Director of the Office of Special Enforcement (OSE), supervising OSE’s Legal Team in all aspects of the Office’s affirmative, defensive, and administrative litigation.  Prior to joining OSE, Aron litigated complex civil actions in private practice in state and federal court, and served as a director and pro bono general counsel for a not-for-profit preschool in Brooklyn.  He also served as a federal judicial law clerk to the Honorable Lois Bloom, Magistrate Judge in the United States District Court, Eastern District of New York.  Mr. Zimmerman earned his J.D. from the Benjamin N. Cardozo School of Law.