Nina J. Leibig is a prominent civil rights and criminal defense attorney based in Alexandria, Virginia. She is a partner at Zwerling, Leibig & Moseley, P.C., a firm she co-founded, where she specializes in appellate litigation, constitutional law, and challenges to police misconduct. Her expertise includes appellate work, constitutional challenges, and civil liberties cases, particularly involving First Amendment protections, excessive force by law enforcement, and governmental overreach. Leibig has built a reputation for her rigorous defense of individual rights and has represented clients in high-stakes appeals in federal courts, including arguments before the U.S. Court of Appeals for the Fourth Circuit and other circuits.

Leibig's career spans over three decades, beginning after her graduation from the University of Virginia School of Law. She has contributed to legal scholarship and advocacy for criminal justice reform. As a partner with John K. Zwerling, she collaborates on complex litigation, emphasizing ethical and zealous representation. Leibig is recognized within the legal community for her expertise and commitment to public interest causes, though she maintains a relatively low public profile outside her professional endeavors.

Her practice focuses on protecting vulnerable individuals against systemic injustices, and she has been involved in lawsuits against government entities for rights violations. Leibig's contributions extend to mentoring young lawyers and participating in bar association activities, underscoring her influence in the field of civil rights law.