Don Sinclair Davis was born on 4th August 1942 in Aurora, Missouri, USA. He earned a Bachelor of Science degree in theatre and art from Southwest Missouri State College.
Davis spent time in the military serving in the 7th Infantry in Korea and at another point was a personnel and administration officer; he was a captain at Fort Leonard Wood by the time he left the U.S. Army.
In 1970 Davis received a Master’s Degree in Theatre from the Southern Illinois University Carbondale (SIU); his thesis was “Design and Construction of Stage Settings for Black Comedy and The Two Executioners”. Davis then moved onto teaching, which he did for many years before returning to SIU to complete a Ph.D. in Theatre; his dissertation was The Evolution of Scenography in the Western Theater.
By the early 1980’s Davis began exploring the film and tv world and in 1982 made his debut on the small screen in an episode of Joanie Loves Chachi.
In 1985 more roles came in which included appearances in The Journey of Natty Gann and Danger Bay. Then the following year Davis appeared in Walt Disney’s Wonderful World of Color; further roles followed in Spot Marks the X, That Secret Sunday, Deadly Deception, Sworn to Silence, Malone, Stakeout, and The New Adventures of Beans Baxter.
By 1987 Davis had quit teaching and was focused on acting full-time, he was rewarded with roles in the likes of Body of Evidence, MacGyver, Watchers, The Beachcombers, Wiseguy, Beyond the Stars, Look Who’s Talking, Rescue Force, L.A. Law, Look Who’s Talking Too, 21 Jump Street, and Omen IV: The Awakening.
Then in 1990 Davis was cast as Maj. Garland Briggs in the series Twin Peaks. Davis carried the role with such magnitude that the character remains relevant to the plot in the current Twin Peaks revival series even though Davis himself died several years earlier. He would also reprise the role in Twin Peaks: Fire Walk With Me in 1992.
Following Twin Peaks, Davis appeared in The Gambler Returns: The Luck of the Draw, Kuffs, Hook, Nightmare Café, Knots Landing, A League of Their Own, Accidental Hero, Columbo, Dead Ahead: The Exxon Valdez Disaster, Street Justice, Highlander, Cobra, Northern Exposure, and M.A.N.T.I.S.
In 1994 Davis was cast as Captain William Scully, the father of FBI Agent Dana Scully in The X-Files. Whilst only appearing in two episodes he again provided a performance that would impact of the mythosof the series.
Further roles included Black Fox, Black Fox: The Price of Peace, The Outer Limits, Madison, Profit, The Fan, Poltergeist: The Legacy, In Cold Blood, Viper, The Sentinel, Honey, I Shrunk the Kids: The TV Show, Atomic Train, The 6th Day, The Twilight Zone, G.I. Joe: Spy Troops the Movie, Andromeda, The West Wing, The Dead Zone, Psych, The Uninvited, Seed, and Supernatural.
In 1997, Davis took on the role of Major General George Hammond in Stargate: SG1. As the man in charge of Stargate he won over a whole new legion of fans. He would play the role for the rest of his career including an appearance in the spinoff series Stargate: Atlantis.
Sadly Davis passed away on 29th June 2008 following a heart attack. His impact and work still live son, especially in Twin Peaks where he is still appearing!