What is the future of finance? Will Silicon Valley challenge Wall Street? Can China build global banks?

There are few better places to contemplate such questions than Jamie Dimon's office, high in JPMorgan Chase's headquarters in New York City above Park Avenue. It's now more than three decades since Dimon, the son and grandson of stockbrokers, teamed with Sandy Weill at American Express. Together they helped transform the financial industry—first at Travelers and then with Citigroup. Ousted by his mentor, Dimon became chief executive officer of Bank One, which he later sold to JPMorgan. In Dimon's 10 years as CEO, JPMorgan Chase has delivered a higher total return than every major American bank except Wells Fargo. Dimon has also endured setbacks, such as the huge trading losses run up by the "London Whale" and more than $36 billion in settlements and fines since the financial crisis.