In my quest to get signatures from all of the special guests at GaryCon VIII, I tracked down Jeff Perren, in the miniatures warfare room.
He graciously signed his blurb in my program.
During the Growing Up Gygax session I had attended just a short while before, Luke mentioned that Jeff Perren had disavowed the fantasy portion of Chainmail, and that it was all Gary. So I asked him if he was getting ready to play Chainmail, at the sandtable where he was sitting, and he said, “No, Cavaliers and Roundheads.” Then he said something I didn’t expect. “I have never played Chainmail by the rules as published.”
He was gracious enough to let me get out my cellphone and let me record his re-statement of what he told me.
I stopped recording too soon. Jeff went on to talk about the last time he played against Gary in 2006. I believe the picture of them together in the program guide is of that day.
NOTE: If I am not the first to ask this question and publicize his answer, please let me know with a formal citation of the source.