S tephen Feinberg is a highly secretive and powerful American billionaire who is the co-founder and co-CEO of Cerberus Capital Management, a major global private equity firm. He co-founded the firm in 1992, naming it after the three-headed dog from Greek mythology that guards the underworld, a nod to the firm's deep expertise in distressed investing. Cerberus has grown into a massive alternative asset manager, known for its complex and often contrarian investments in struggling companies across a wide range of industries.

Feinberg is particularly known for his firm's high-profile investments in the automotive sector, having owned both Chrysler and GMAC (now Ally Financial), and in the defense and firearms industries. Through his firm, he owned Freedom Group, which included major gun manufacturers like Remington and Bushmaster, a holding that has made him a highly controversial figure. He is notoriously private, rarely gives interviews or allows himself to be photographed, and has built a reputation as one of the most powerful and low-profile figures on Wall Street.