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an American computer scientist and early computer chess programmer when he was undergraduate student at [[University of Waterloo]] in the mid 70s. Along with [[Jim Parry]], [[Russell Crook]], and [[Gary Calnek]], he was co-author of the successful mainframe programs [[Ribbit]] <ref>[https://cs.uwaterloo.ca/40th/Chronology/ChronologyGlossary.pdf Waterloo@50] (pdf) 2007</ref> and its successor [[Treefrog]] <ref> [[Monroe Newborn|Monty Newborn]] ('''1977'''). ''[http://www.atariarchives.org/bcc2/showpage.php?page=22 Summary of the ACM Sixth U.S. Computer Chess Championship]''. [[Creative Computing#Best2|The Best of Creative Computing Volume 2]], edited by [https://en.wikipedia.org/wiki/David_H._Ahl David Ahl], hosted by [http://www.atariarchives.org/ AtariArchives.org] » [[ACM 1975]]</ref>, and wrote a master thesis on computer chess <ref>[httphttps://www.cs.uwaterloo.ca/%7Ealopez~alopez-o/divulge/chimp.html An Introduction to Computer Chess] by [http://www.cs.uwaterloo.ca/%7Ealopez-o/ [Alejandro López-Ortiz]], 1993</ref>. At his time at Waterloo, [[Jonathan Schaeffer]] benefited from the presence of Ron Hansen, who generously gave him a copy of Ribbit's [[Fortran]] source code, which he used to learn how to write a chess program <ref>[[Jonathan Schaeffer]] ('''1997, 2009'''). ''[http://www.springer.com/computer/ai/book/978-0-387-76575-4 One Jump Ahead]''. 1. This Was Going to Be Easy, pp. 7</ref>.