When he graduated to Formula 1 in 1993 Rubens Barrichello looked a potential star. By 1996—still grieving the death of his mentor Ayrton Senna—Rubens seemed a "might have been," struggling with an uncompetitive Jordan. However in 1999, driving for Jackie Stewart, he proved a mature performer and Ferrari beckoned. The Brazilian is a rare mix—tough enough to be Michael Schumacher’s fastest-ever teammate yet so gentle off-track that he is the most popular driver in the paddock. This is his rollercoaster story.