The video is about Jim Simmons, a billionaire hedge fund manager and mathematician who founded Renaissance Technologies, a quantitative trading firm.
The video discusses how Simmons revolutionized the field of investing by using mathematical models and algorithms to analyze and predict market trends, a technique known as quantitative investing. The video also covers Simmons' background, his early career as a codebreaker for the National Security Agency, and his philanthropic efforts in the fields of education and science. The video is likely to be of interest to those interested in finance, investing, and mathematics.