Depending on how much programming background he has, pg's On Lisp might be a good option as well, and it's free: http://www.paulgraham.com/onlisp.html http://ww

Depending on how much programming background he has, pg's On Lisp might be a good option as well, and it's free: http://www.paulgraham.com/onlisp.html http://www.paulgraham.com/onlisp.html