From the Traveller RPG wiki on wikia.com:
Jeff is a regular reader and sporadic participant on the Traveller Mailing List and the Traveller Technical Development Mailing List, and he created and coördinates the Traveller Culture Development Mailing List. He also maintains the Freelance Traveller web 'zine. Jeff was introduced to Traveller while he was at college, in Traveller's early days. His interest in Traveller is mostly in development of background and support material rather than play or refereeing.
When he's not doing Traveller stuff, Jeff is a precinct network administrator for the New York City Police Department. When he's not doing that, either, he can sometimes be found working as a herald in the Society for Creative Anachronism.