Before Breach by Hackers, JPMorgan Suffered Exodus of Tech Talent

As hackers pierced JPMorgan Chase & Co.’s defenses in June, the bank’s cybersecurity chief was just getting acquainted with his employer and its sprawling technology infrastructure.

Greg Rattray, a former U.S. Air Force commander for information warfare, became JPMorgan’s head of information security that month after upheaval at the highest levels of the bank’s tech division. His predecessor, Anthony Belfiore, resigned early this year to join at least five JPMorgan leaders at First Data Corp. In between, Anish Bhimani was acting security officer while holding at least one other tech role.

“It sucks that this happened at the beginning of ...