Paul Graham (born 13 November 1964) is an English-born American computer scientist, entrepreneur, venture capitalist, author, and essayist. He is best known for his work on Lisp, his former startup Viaweb (later renamed "Yahoo! Store"), co-founding the influential startup accelerator and seed capital firm Y Combinator, his blog, and Hacker News. He is the author of several programming books, such as: On Lisp (1993), ANSI Common Lisp (1995), and Hackers & Painters (2004). Technology journalist Steven Levy has described Graham as a "hacker philosopher".