For those interested in GP, here is Koza's course page (pdfs & source):

http://www.genetic-programming.com/coursemainpage.html

Koza "invented" GP. However, parent article is really describing Evolutionary Programming, invented by Fogel in the 1960s. The difference? Ostensibly, no crossover operator in EP, only mutation.

http://www.scholarpedia.org/article/Evolutionary_programming