JPMorgan’s CEO Jamie Dimon reveals the career goal he adopted when he was just a 28-year-old assistant: Do not speak unless you can add value

JPMorgan CEO Jamie Dimon adopted a career principle at age 28 to only speak when he could add value, which helped propel him to a CFO role by age 30. This modest communication rule became a key factor in his early career advancement before becoming the billionaire head of one of America's largest banks.