Maureen Farrell, 09.21.06, 6:00 PM ET
They've come a long way from their first jobs as gas station attendants, bookstore clerks, short-order cooks and door-to-door garbage-bag salesmen.
In the accompanying slide shows, 14 self-made members of the Forbes 400 gave us an exclusive peek at their childhoods, dreams, mistakes, routines and motivations. The titans weighed in on topics like what it takes to be a stratospherically wealthy entrepreneur, what other vocational paths they might have chosen, how much they read, and if an M.B.A. is worth the paper it's printed on.