Cliff Sloan, a longtime Skadden, Arps, Slate, Meagher & Flom partner, marked his last day at the firm Friday and is moving on to Georgetown University Law Center.

The Washington, D.C., litigator has argued seven times before the U.S. Supreme Court and handled matters ranging from antitrust law and intellectual property to criminal law in trial and appellate courts across the country. He was the Obama administration’s special envoy for efforts to close the Guantanamo detainment center from 2013 to 2014 and served as associate counsel to President Bill Clinton, among other government roles. He is also a former publisher of Slate Magazine.