Elizabeth Conley/Houston Chronicle via Getty From left: Philanthropists Laura and John Arnold on Oct. 9, 2018, in Houston. In 2023, John was ranked 345th on the Forbes 400. In 2008, John and Laura launched the Laura and John Arnold Foundation, which has since evolved into Arnold Ventures. Rick Kern/Getty John Arnold, Co-Founder and Co-Chair, Arnold Ventures, speaks on stage during The Texas Tribune Festival at Omni Hotel on September 06, 2024 in Austin, Texas. In 2010, both John and Laura signed The Giving Pledge, which was launched that same year by Bill Gates and Melinda French Gates.

Source: Forbes December 27, 2025 15:58 UTC