Lumberjack, stevedore, merchant seaman, naval officer, spy, cowboy, Texas Ranger, forest ranger, Foreign Legionnaire, premier danseur, mountain guide, prizefighter, parfumier, tightrope walker, astronaut, deep sea diver, sommelier, alligator wrestler... These are just a few of the many jobs David Dvorkin has never had, never will have, and with one exception, never wanted to have.