Jeff Yass was born in 1956 in Binghamton, New York. He attended New York University and Binghamton University, where he studied mathematics. After graduating from college, Yass worked as a professional gambler for several years before becoming a trader at the Philadelphia Stock Exchange. In 1987, Yass co-founded Susquehanna International Group (SIG), a proprietary trading firm. SIG has become one of the largest and most successful trading firms in the world. Yass is the managing director of SIG and is considered one of the most successful traders in history. Yass is also an early investor in TikTok, the Chinese social media app. He has invested billions of dollars in TikTok and is considered one of the largest shareholders in the company. Yass is a major political donor and is considered one of the most influential people in the [Republican Party](https://doctorparadox.net/the-gop-is-3-cults-in-a-trenchcoat/). He has donated millions of dollars to Republican candidates and causes, and he has been a major supporter of former President [[Donald Trump]].