Then there is Jonathan Grossweiler, D.W.S. since 2006, a powerfully built, shaven-headed ex-Marine from somewhere in New Jersey.

"I'd rather not say which town I live in," Mr. Grossweiler, 34, told me. "I don't want the inmates to be privy to that information." Those inmates are at a prison for sex offenders in Middlesex County, N.J., where he works the 6 a.m. to 2 p.m. shift as a corrections officer.

Why and how did a prison guard embark on a journey to becoming a wine expert? Mr. Grossweiler answered those questions last week in an interview at the International Wine Center in Manhattan, where he got his diploma.

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