T homas Sandell is a Swedish billionaire hedge fund manager based in London. He is the founder of Sandell Asset Management Corporation (SAMC), a firm known for its event-driven and activist investing strategies. After a career working for major investment banks like Bear Stearns, where he was a senior managing director, he founded his own firm in New York in 1998.

Sandell's firm became known for its activist campaigns, where it would take stakes in publicly traded companies and push for changes, such as spin-offs, mergers, or share buybacks, in order to unlock what it perceived as hidden shareholder value. The success of his hedge fund over many years is the primary source of his billion-dollar fortune. He has since relocated his main operations to London. He is also known as a prominent collector of modern and contemporary art.