In 1999, James Feldkamp joined the Federal Bureau of Investigation (FBI) as a Special Agent. At the FBI, James was tasked with investigating federal crimes, particularly in international and domestic terrorism. He also led and participated in foreign counterintelligence operations.
James was a founding member of the Tidewater Joint Terrorism Task Force (JTTF), which was responsible for investigating and prosecuting individuals identified as participants in domestic and foreign terrorism activities. The joint task force prosecuted cases against members of Hamas, Al-Qaeda, and Hezbollah.