JPMorgan chief executive Jamie Dimon has emergency heart surgery

Jamie Dimon, the longtime chairman and chief executive of JPMorgan Chase, had an emergency medical procedure on his heart on Thursday, according to a memo sent to bank employees. Mr. Dimon, 63, underwent successful heart surgery for an “acute aortic dissection,” and he is recovering, said the memo, which was reviewed by The New York Times. He checked himself into a hospital Thursday morning after experiencing chest pains, according to a person familiar with the matter.