When the Senate Judiciary Committee recently held a hearing on closing Guantanamo Bay, Jenner & Block co-managing partner Katya Jestin was one of the few witnesses called to testify before lawmakers.

For years Jestin has represented Majid Khan, one of the detainees at Guantanamo, who earlier this year gave graphic and distressing testimony about the extent of the torture he experience while held at a CIA black site, information that had never been previously disclosed. All but one member of the military jury that heard Khan’s testimony asked for clemency to be granted in his case, calling his torture “a stain on the moral fiber of America.”