Kaj was an award winning correspondent and producer for CNN. His on-camera career began in 2005 when he covered the war in Afghanistan for Current TV. At Current TV Kaj helped develop the Emmy Award winning Vanguard Journalism series. He was the first journalist to bring the issue of waterboarding to the public by having himself waterboarded on TV. He broke the media silence on Somalia by being the first western TV journalist in Mogadishu in over a decade. He has since gone on to report from war zones and conflict spots around the world, in places such as Yemen, Cambodia, Colombia, and Haiti. In 2010 Kaj joined CNN as a correspondent for the Special Investigations and Documentary unit. At CNN his feature documentaries have covered topics ranging from the drug war in Mexico to the devastating floods in Pakistan to Wikileaks. His reporting at CNN is distinguished by his in-field and in-depth examination of difficult and dangerous topics around conflict zones, national security, and criminal justice.

Prior to his work in television journalism, Kaj spent five years on active duty serving as a US Navy SEAL. As a Lieutenant he led a team of special warfare personnel in covert operations overseas deploying as a detachment Commander in support of the Global War on Terrorism. He continues his service as a SEAL reserve officer assigned to US Special Operations Command.