Christian served in various positions at the Department of Justice and the Department of Defense for nearly a decade. He most recently held the role of Deputy Assistant Attorney General in the Department of Justice’s Office of Legal Policy, where he supervised several priority portfolios, including national security, law enforcement, terrorism and violent crime prevention. He previously worked as a prosecutor in the Department of Justice's Counterintelligence and Export Control Section, where he managed investigations and prosecutions affecting national security, and as an Associate Deputy General Counsel at the Department of Defense, where he advised on complex national security and counterterrorism litigation.