Mark Harris is a partner in the Litigation Department, co-head of the Appellate Practice Group, and a member of the Securities Litigation and White Collar Defense & Investigations Groups. He represents institutional and individual clients in both civil and criminal litigations.

Mark is a former clerk to U.S. Supreme Court Justices John Paul Stevens and Lewis Powell, Jr., and Judge Joel Flaum of the U.S. Court of Appeals for the Seventh Circuit. Mark subsequently served as an Assistant U.S. Attorney for the Southern District of New York, during which he prosecuted a broad spectrum of federal crimes, including health-care fraud, financial fraud, and corporate embezzlement, and tried a number of jury trials and argued before the Second Circuit.