The reader may notice that three of those are about Italy. There's a reason for that: his mother is from Gaeta, and Jack has visited Gaeta many times, Formia several times and Ponza once.
Jack has made various minor contributions to other pages (cleaning up English, for example) and may contribute to other articles as time and interest permit.
Professionally, he is a mathematician, who has taught at the high-school and university levels, and who researches computer algebra - in particular, "combinatorial criteria for Gröbner bases," which is a lot more fun than it probably sounds.
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