Like legendary investor Warren Buffett, JPMorgan CEO Jamie Dimon’s finance career started in childhood. A Wall Street stockbroker, Dimon’s father, Theodore, encouraged all three of his sons to learn more about the markets, but only Jamie leaned in. After graduation, Dimon landed his first Wall Street role as an assistant to then-American Express president Sanford “Sandy” Weill. Today, Dimon is one of the only remaining Wall Street CEOs still in place from the 2008 financial crisis. At the Fortune Most Powerful Women Summit in 2025, Dimon told Fortune Editor-in-Chief Allyson Shontell he gives 100% effort “every day, every meeting.”