Paul Graham (born 13 November 1964) is an English computer scientist, venture capitalist, and essayist. He is known for his work on Lisp, for co-founding Viaweb (later renamed "Yahoo! Store"), and for co-founding the Y Combinator seed capital firm. He is the author of some programming books, such as: On Lisp (1993), ANSI Common Lisp (1995), and Hackers & Painters (2004).