 In his law practice at Kirkland & Ellis, he focused on antitrust (mergers and litigation), securities law (including class action litigation and regulatory investigations), and various other regulatory, constitutional, and commercial litigation matters, both at the trial and appellate levels.In April 2004, Bradbury left private practice after being appointed as the Principal Deputy Assistant Attorney General at the OLC under Assistant Attorney General Jack Goldsmith, becoming Acting Assistant Attorney General in February 2005.He was nominated by President George W. Bush to be the Assistant Attorney General for OLC on June 23, 2005.