JPMorgan is going through a big investment-banking leadership shakeup and 18 rainmakers have new roles keeping its biggest clients happy

· JPMorgan's head of investment banking, Carlos Hernandez, is now the executive chairman of investment banking, according to a JPMorgan memo viewed by Business Insider.
· New co-heads Jim Casey and Vis Raghavan will take on day-to-day management responsibility for the firm's investment banking arm, reporting to Hernandez.
·...