Former U.S. Secretary of Homeland Security Jeh Johnson will rejoin Paul, Weiss, Rifkind, Wharton & Garrison on Monday for the fourth time in three decades, continuing a long habit of returning to the firm after stints in public service.

President Obama appointed Johnson to lead the Department of Homeland Security in late 2013. He served as general counsel of the Department of Defense from 2009 to 2012, where he oversaw the repeal of the “don’t ask, don’t tell” policy that barred gay people from serving openly in the military. He was a key legal architect of the Obama administration’s counterterrorism policies, including its use of drones to kill terror suspects abroad.