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I know this is a weird one, but William Higinbotham. He made "Tennis for Two" the first real interactive computer game, in 1958. There were a couple of earlier games, like tic-tac-toe, but that's more of a board game in a digital format than an actual video game. I've had almost every video game system made since I got my Atari 2600 as a kid, and I still play games more days than not, and so do most of my under 40 friends. Video games really were the genesis of my love of technology, and I doubt I would have made some of the choices that led me down my career path otherwise. I would have also missed out on all of those fantastic Madden Football tournements in college!