Keiber was born in Wilmington, North Carolina. He is the first born of three boys, Cameron and Clayton, to Robert John Keiber, an artist and theater actor and Sharon Verner, a pharmaceutical representative. He grew up backstage at the Raleigh Little Theater were he would watch his father perform in several musicals and plays over the years. When he was nine, the Keiber family moved to a small town in upstate New York called Greenwood Lake.