That would be Richard Dean Anderson
Harry Dean Stanton is another actor, entirely
who has also done his share of SciFi, including Escape From New York (he played "Brain") and Alien (he played one of the repairmen, "Brett")
Where's Harry Dean Anderson? I'm still on Season 1.
Anderson is not a regular on Season 9. He's still Exec. Producer of the show, but I think he wanted to spend more time with his family. He was replaced by Ben Browder who used to be on Farscape. Amanda Tapping is still on the show, that's all I care about :)
That would be Richard Dean Anderson
Harry Dean Stanton is another actor, entirely
who has also done his share of SciFi, including Escape From New York (he played "Brain") and Alien (he played one of the repairmen, "Brett")