John Kellner

John Kellner most recently served as the elected District Attorney for Arapahoe, Douglas, Elbert and Lincoln counties, where he was responsible for seeking justice for over 1.1 million Coloradans. As a highly accomplished lawyer with unique trial experience and elite trial skills, he tried several of Colorado’s toughest and most prominent cold cases. Throughout his nearly two-decade career in criminal justice, John was recognized as the top prosecutor in the state by the Colorado District Attorney’s Council and by Mothers Against Drunk Drivers.

John is a U.S. Marine Corps and Afghanistan War veteran who served on active duty as a trial counsel, operational law attorney, and Special Assistant United States Attorney. He continues to serve as a Lieutenant Colonel in the Marine Corps Reserves, responding to natural disasters and supporting homeland defense missions. 

John is a graduate of the University of Colorado-Boulder School of Law. He and his wife Sarah are avid skiers and love to spend time with their children. John is the Managing Partner at the Dan Caplis Law firm.