Many thanks to all those who responded, the answer is John Casti in 1967.
Omar Guerrero summarised it best as follows:
During the summer of 1967, Schelling had already experimented with the
model manually. He made a research visit to the RAND Corporation and
John Casti, a young mathematician, was assigned as his assistant.
Schelling asked him to program his model. Casti made a version of the
model that showed each step of the simulation in a printed sheet. By
the end of the experiments (which took months), he had accumulated
tons of sheets with some results. These results were not so clear or
revealing to Schelling, so he dismissed them and continued refining
the model and playing with it manually. However, Casti saved the
prints and in his book he talks about his learning.
Part of this story comes from Casti's book, and part was told to my by
Professor Axtell, who knows both Schelling and Casti very well.
Probably he has a better recalling of the details.
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Regards.
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Bruce Edmonds
Centre for Policy Modelling
Manchester Metropolitan University
Aytoun Building, Aytoun Street, Manchester M1 3GH, UK.
Tel. +161 247 6479 Fax. +161 247 6802
http://bruce.edmonds.name
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