The race to succeed Jamie Dimon once included Jennifer Piepszak, Marianne Lake, and Mary Erdoes. Here's how the field narrowed to a two-man race.

Dimon, who turned 70 in March, has been JPMorgan's boss for two decades, steering it through the financial crisis.

JPMorgan reshuffles its executive team as Daniel Pinto retires and Jennifer Piepszak becomes COO, narrowing the race to succeed Jamie Dimon.