Which Apple co-founder guest-starred as himself on The Big Bang Theory?

Apple co-founder Steve Wozniak guest-starred as himself on The Big Bang Theory. He appears in the season four episode “The Cruciferous Vegetable Amplification.”

In the episode, Sheldon spots Wozniak at The Cheesecake Factory and tries to speak with him through a telepresence robot. Sheldon wants Wozniak to autograph his Apple II, but he rushes to meet him, falls down the stairs, and breaks the computer before the signing can happen. The scene combines Sheldon’s intense admiration for technology with his familiar inability to manage ordinary social situations.

Wozniak co-founded Apple Computer with Steve Jobs in 1976 and designed or co-designed influential early computers including the Apple I and Apple II. That history explains why Sheldon treats meeting him as a major event. Wozniak’s cameo is played as a fictionalized encounter, but he appears as himself rather than portraying a character.

Steve Jobs is a common wrong answer because he was Wozniak’s famous Apple co-founder. Jobs never made this cameo. The episode first aired on September 30, 2010, during the show’s fourth season.