David Remes, among the most visible advocates for detainees at Guantanamo Bay, is leaving Covington & Burling at the end of the month.

Remes, who represents 15 Yemeni detainees, announced his resignation on July 18, saying that he plans to devote himself exclusively to human rights litigation. “My departure is the inevitable outcome of my human rights work at the firm in the past four years, which became a consuming passion,” Remes said in a statement.