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Jack enters his first year at Missouri University of Science and Technology.
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His company is used by dispatch couriers, taxis, and emergency services.
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Jack drops out of New York University to pursue his dispatch software company
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Jack posts the world's first Tweet.
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Named one of the top innovators of the world under 35.
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Evan Williams takes the role of CEO and Jack moves over to chairman of the board.
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Twiiter hits 105 million users who, collectivly, post 55 million times a day
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Jack launches Square, an electronic payment service. Square allows users to accept credit cards through their mobile phones.
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Jack takes the spot of 392 out of 400 on the Forbes 400 list.
