Michael Bloomberg

Michael Rubens Bloomberg (born February 14, 1942) is an American businessman and politician. He is the majority owner and co-founder of Bloomberg L.P., and was its CEO from 1981 to 2001, and again from 2014 to 2023. He served as the 109th mayor of New York City from 2002 to 2013. He was a lifelong Democrat until 2001, when he switched to the Republican Party to run for mayor, and later became an Independent in 2007. Bloomberg is the most recent Mayor of New York City to serve as a Republican or Independent. In 2018, he rejoined the Democratic Party, after which he ran an unsuccessful campaign for the 2020 Democratic nomination for president of the United States. Bloomberg is a centibillionaire, worth $109.4 billion as of December 2025, making him the 17th richest person in the world.
Bloomberg grew up in Medford, Massachusetts, and graduated from Johns Hopkins University in Baltimore, Maryland, and Harvard Business School in Boston, Massachusetts. He began his career at the securities brokerage firm Salomon Brothers, before forming his own company in 1981. That company, Bloomberg L.P., is a financial information, software, and media firm that is known for its Bloomberg Terminal. Bloomberg spent the next twenty years as its chairman and CEO. Bloomberg, who has signed the Giving Pledge, has given away $17.4 billion to philanthropic causes in his lifetime. After a brief stint as a full-time philanthropist, he re-assumed the position of CEO at Bloomberg L.P. by the end of 2014.