Among the pro bono lawsuits that lawyers for Guantánamo Bay detainees have filed over the years, William Livingston’s win last year for a Yemeni man marked a rare accomplishment.

The Covington & Burling senior counsel has been leading a team that has filed habeas corpus petitions challenging the imprisonment of seven Yemeni men held for more than a decade without charges at the naval base. Covington began filing the suits in 2004, but they didn’t gain traction until the U.S. Supreme Court in 2008 upheld the detainees’ right to petition for writs of habeas corpus.