The article says that John picked up lacrosse in Montclair, but actually he learned it (or at least significantly refined it) at Frost Valley. It was time when lacrosse was all the rage at camp, led by (among others) then-Montclair High School star player (and now active FV alumnus) Rick Cobb. John Dudley was one of many young African American kids at Frost Valley at summer camp in those days who learned what was then deemed a suburban and "all-white" sport. (Even today: "Some had never heard of lacrosse, much less seen the game played.")
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Something else is interesting here. The New York Times article was written by a Frost Valley-affiliated guy. Here's Lisa Colton to explain: "another FV connection is that [the article] is written by Harvey Araton, who is the father of Charlie and Alex Araton. Charlie was my CIT last year and is a staff member now and Alex worked as a staff member a few years ago!"