On a typically perfect summer day in Los Angeles,Patrick Soon-Shiong, the richest doctor in the history of the world, is bunkered inside his clandestine headquarters (nestled behind a security gate so unobtrusive that Uber cars consistently miss it), ready to show around a kindred spirit. T. Denny Sanford, who made a $2.8 billion fortune selling high-interest-rate MasterCards to people with bad credit scores, is now in philanthropy mode, giving away most of his fortune to children's charities and hospitals. And he's come to see what's been touted as the future of medicine.