Engineers and designers at the headquarters of Apple Computer Inc. in Cupertino, Calif., are accustomed to seeing a slender figure saunter past their offices wearing frayed jeans, suede boots and a cowboy shirt. The boyish-looking fellow with the stringy mustache is Steven Jobs, Apple's chairman of the board. At 26, Jobs heads a company that six years ago was located in a bedroom and garage of his parents' house, but this year it is expected to have sales of $600 million. Like so many new entrepreneurs, Jobs is a child of California's Silicon...

