Consulted by policymakers and able to nudge his peers into action, JPMorgan Chase CEO Jamie Dimon played a key role in a bank rescue effort this week -- a situation sparking reminders of 2008. Yellen raised the idea of major banks stepping in together, said a source familiar with the matter. Dimon, who has led JPMorgan since 2005, is the last remaining boss of a major bank still in place after the 2008 financial crisis. While there was no question this time of taking over a troubled bank, Dimon met with Yellen on Thursday afternoon after her appearance at a Senate hearing. The aim was to discuss the final details of a plan that would eventually see 11 major banks put together deposits of $30 billion into First Republic.