Geraint Wyn Davies was born in Swansea, Wales on April 20, 1957. His father is a semi-retired Welsh congregational minister and his mother, a retired teacher, who was headmistress of Geraint's first school. At the age of seven, his family moved to Canada where he attended Upper Canada College then the University of Western Ontario where he briefly studied business and economics before leaving to pursue his acting career.
Geraint is divorced from artist Alana Guinn however they are the proud parents of a son, Galen, and a daughter, Pyper.
He became a U.S. citizen on June 13, 2006, at a swearing-in ceremony at the Supreme Court in Washington, D.C. Justice Ruth Bader Ginsburg presided over his induction ceremony.