In 2005, Jamie Dimon became the CEO of JPMorgan Chase. He brought in Troy Rohrbaugh, a Goldman Sachs foreign-exchange derivatives trader. This move proved to be successful, as Rohrbaugh helped JPMorgan earn hundreds of millions during the financial crisis, update its trading technology, and jump from ninth to first place globally in foreign exchange rankings over 10 years.
Source: https://www.wsj.com/finance/banking/the-options-trader-who-emerged-as-a-surprise-front-runner-to-succeed-jamie-dimon-d40e341a