How's this for a gripping corporate story line: Youthful founder gets booted from his company in the 1980s, returns in the 1990s, and in the following decade survives two brushes with death, one securities-law scandal, an also-ran product lineup, and his own often unpleasant demeanor to become the dominant personality in four distinct industries, a billionaire many times over, and CEO of the most valuable company in Silicon Valley.