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Paul Graham is a programmer, writer, and investor. In 2005 he co-founded Y Combinator, a seed capital firm that has invested in hundreds of startups including Optimizely, Dropbox, Airbnb and Stripe. Previously, in 1995, he started Viaweb with Robert Morris, the first software as a service company. Viaweb was acquired by Yahoo in 1998, where it became Yahoo Store. Paul began publishing essays in 2001 on paulgraham.com, which reached 12 million page views in 2014.