Jamie Dimon Conquered Wall Street. Who Will Replace Him?

In the nearly 20 years since Jamie Dimon took the top job at JPMorgan Chase & Co., he’s grown the bank to a size that may once have seemed impossible—almost quadrupling its balance sheet to $4.6 trillion.

And thanks to one of the costliest construction projects in New York history, Dimon, 69, will soon run America’s biggest bank from a brand new megatower—one that anchors a group of skyscrapers that will create JPMorgan’s own Manhattan neighborhood. That new home is arguably a symbol of the oversized role the bank, and its billionaire chief executive, play across global finance. In this ...