- Started acting as a child, working in summer stock with the Straw Hat Players in Ontario.
- Served as assistant director of England's National Theatre for six years, working under acting legend Laurence Olivier.
- Was artistic director of the National Theatre School's English Acting Program in Montreal.
- In 1989, he opened the William Davis Centre for Actors' Study—which counts Xena star Lucy Lawless among its former pupils—in Vancouver.
- An avid water skiier, he has been Canadian national champion in his age division several times.
- Contrary to his X-Files character, who was known as the "Smoking Man" or "Cancer Man," ex-smoker Davis is a Canadian Cancer Society spokesperson; he quit smoking in the 1970s and used herbal cigarettes on the show.
- Published his memoir, Where There's Smoke....The Musings of a Cigarette Smoking Man, in 2011.
- 1996, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
- 1998, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
- 1997, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
- Donald Davis — Cousin
- Marie Davis — Cousin
- Aubrey Davis — Grandfather
- Emmanuelle Herpin — Wife
- Barbara Ellison — Ex-significant Other
- Melinda Davis — Daughter
- Rebecca Davis — Daughter
- University of Toronto, Toronto, Ontario, Canada (BA in Philosophy, 1959); The London Academy of Music and Dramatic Art, London, England
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