Former King & Spalding partner Robert Hur was sworn in Monday as Maryland’s U.S. attorney, taking the post Rod Rosenstein held for more than a decade before his elevation in the Trump administration to the U.S. Justice Department’s second-in-command.

Hur, confirmed to the post in March, moves from a supervisory role at Main Justice in Washington to lead nearly 90 assistant U.S. attorneys as the top federal prosecutor in Maryland. Hur was a King & Spalding partner from 2014 to June 2017, when he joined the Justice Department under U.S. Attorney General Jeff Sessions. Hur was an associate at the firm in the mid-2000s.