Actor/Actress with the Most Impeccable "Nerd" Credentials

If it's sci-fi genre as being "nerd", I'd submit Sigourney Weaver. Alien movies, Ghostbusters 1 and 2, Galaxy Quest, Avatar. Maybe there's more, those just come to mind.
She also voiced the ship's computer in WALL·E and was the bad guy in Marvel's Defenders on Netflix, so that's a couple more.