Lisa Monaco, a veteran official of Washington’s highest levels, is joining O’Melveny & Myers as partner and co-chair of the firm’s data security and privacy group.

Monaco’s government career spanned the U.S. Justice Department, the Federal Bureau of Investigation and the Obama White House. She served 15 years at the DOJ, including as assistant attorney general for national security, spent three years at the FBI, including as counsel and chief of staff to then-director Robert Mueller, and was homeland security adviser for the duration of President Barack Obama’s second term, after John Brennan left the position to lead the Central Intelligence Agency.