​Caitlin J. Halligan is a litigation partner in the New York office of Gibson, Dunn & Crutcher and Co-Chair of Gibson Dunn’s Appellate and Constitutional Law Practice Group.  She has argued six cases and served as counsel of record for a party or amicus in more than 45 matters at the certiorari or merits stage in the U.S. Supreme Court.  Ms. Halligan has argued dozens of cases before the federal appellate courts, the New York Court of Appeals, and New York’s intermediate appellate courts, and participated in numerous litigations at the trial level as well.

Prior to joining Gibson Dunn, Ms. Halligan served as General Counsel to the New York County District Attorney’s Office.  From 2001 to 2007, Ms. Halligan served as Solicitor General for the State of New York, where she represented the state in federal and state appellate courts and supervised a team of 45 lawyers.  Prior to serving as New York Solicitor General, she was First Deputy Solicitor General.  From 1999 to 2000, Ms. Halligan was the first Chief of the New York Attorney General’s Internet Bureau, where she developed law enforcement and policy initiatives regarding online consumer fraud, privacy, online securities trading and other Internet-related issues.

Ms. Halligan was named by Benchmark Litigation as a “Litigation Star,” and one of the “Top 250 Women in Litigation.”

In 2017, Ms. Halligan was elected as a member of the American Law Institute, the leading independent organization in the United States producing scholarly work to clarify, modernize, and otherwise improve the law. She has served as a member of Columbia Law School’s Adjunct Faculty since 2005; and has served in a pro bono capacity as counsel to the Board of the Lower Manhattan Development Corporation, an entity charged with leading the re-development of the World Trade Center site in downtown Manhattan. In addition, Ms. Halligan has served as a board member of the Fund for Modern Courts and the National Center for Law and Economic Development, as well as a member of several selection committees for the New York state courts.

Ms. Halligan was a law clerk for U.S. Supreme Court Justice Stephen Breyer and Judge Patricia Wald of the U.S. Court of Appeals for the D.C. Circuit.  She graduated magna cum laude in 1995 from the Georgetown University Law Center, where she was Order of the Coif, served as Managing Editor of the Georgetown Law Review and participated as an Olin Fellow in Law and Economics.  Prior to attending law school, she served as a legislative aide for U.S. Representative William Alexander of Arkansas.