This Guy Played a Super Nerd on a '90s TGIF Sitcom, But Now He's a Professor — Who Is He? (PHOTOS)

This guy's hit sitcom was part of ABC's TGIF lineup and had a lengthy seven-season run. He played a super-annoying computer geek in an unconventional family of eight. Now he's all grown-up and not on TV anymore. Think you can identify him? 

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