William B Davis
Biography
William Bruce Davis (born January 14, 1938) is a Canadian actor, best known for his role as the Cigarette Smoking Man on The X-Files. Besides appearing in many TV programs and movies, he founded his own acting school, the William Davis Centre for Actors Study. In 2011 he published his memoir, Where There's Smoke ... The Musings of a Cigarette Smoking Man.
Bio from Wikipedia