Paul Graham, who identifies himself as "an essayist, programmer, and programming language designer" has posted on his website a collection of articles on the history of Lisp, a programming language designed by John McCarthy in the late 1950s. The articles discuss the Roots of Lisp, What Made Lisp Different (in particular, different from Fortran) and the Evolution of Lisp, along with related articles on other aspects of Lisp's history. Other sections of his website include articles on spam filters and essays on a variety of issues written from the perspective of a programmer, including one entitled "What You'll Wish You'd Known," which he wrote for a high school talk that never happened.