Geraint Wyn Davies was born in Swansea, Wales. 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 Wyn Davies' professional stage debut was made in 1976 in Quebec City when at 19 he appeared in "The Fantasticks", "Red Emma", and "A Midsummer's Night Dream". He moved on England where he was the lead in "The Last Englishman". He then spent 2 seasons with Wales' leading theatre company, Theatre Clwyd, touring the United Kingdom in "Enemy of the People" and "Hamlet". It was his performance in "Hamlet" that led to the Regional Theatre Best Actor Award. He has performed with the Chichester Festival, the Shaw Festival and the Stratford Festival of Canada as well as the Mark Taper Forum, Lincoln Center.
Davies' directorial accomplishments include multiple episodes of "Forever Knight", "Black Harbour", "Pit Pony", "Power Play" and "North of 60".
His musical talent was first brought to prominence on "Forever Knight" where he actually played the piano in the loft and co-wrote a song for the "Baby Baby" episode. As a result he was featured in one of the selections on the first "Forever Knight" CD. He is a self-taught musician who produced a CD of his own works "Bar Talk" which is sold through his fan club with the proceeds going to a variety of charities such as Childrens' Hospital Foundation in Washington D.C. and The Stratford Festival's Shakespeare School (Stratford, Ontario).
Geraint Wyn Davies' voice can be enjoyed on two audio books, "Great American Suspense: Five Unabridged Classics" and "Great Classic Hauntings: Six Unabridged Stories".
He became a U.S. citizen on June 13, 2006, at a swearing-in ceremony at the Supreme Court in Washington, D.C.
- Geraint Wyn Davies starred in the Canadian TV series, Forever Knight, as its main character, Nick Knight. In the episode "Blind Faith" (season 3 episode 5), Davies' character has a flashback to when he met Arthur Conan Doyle.