Michael Rubens Bloomberg (born February 14, 1942) is an American businessman, and the founder of Bloomberg L.P., currently serving as the Mayor of New York City. He was a general partner at Salomon Brothers before founding the financial software service company in 1981. Although a lifelong Democrat, he ran on the Republican ballot and was elected mayor in 2001, and was reelected to a second term in 2005. He is frequently mentioned as a possible independent candidate for the 2008 presidential election and fueled that speculation when he left the Republican Party in June 2007; however, he has denied having any plans to run and says the news media had concocted his possible presidential run.
Bloomberg was born to a Jewish family of Russian and Polish ancestry, at St. Elizabeth's Hospital, in the Boston neighborhood of Brighton on 14 February 1942. His parents were Charlotte Rubens, living in 2006, and William Henry Bloomberg, who was born in Chelsea, Massachusetts, the son of Elick Bloomberg, a Russian Jewish immigrant and a real-estate agent. He lived at 100 Brainerd Road, in the Boston neighborhood of Allston, until he was two years old, when the family moved to Atherton Road, in Brookline, Massachusetts. When he was four, his family moved to Medford, Massachusetts, a Boston suburb. He lived there until after he graduated from college. He attended Johns Hopkins University, where he joined Phi Kappa Psi, and graduated in 1964 with a Bachelor of Science (B.S.) degree in electrical engineering. Later he received his Master of Business Administration (MBA) degree from Harvard Business School.
Bloomberg married Yorkshire-born Susan Brown in 1975. After 18 years of marriage, they divorced in 1993. They had two daughters, Georgina Bloomberg (who has been featured on Born Rich, a documentary film about the children of the extremely wealthy) and Emma Bloomberg. Georgina was romantically linked in 2007 with Cian O'Connor, the Irish showjumper whose 2004 Olympic gold medal was withdrawn. His current girlfriend is former New York state banking superintendent Diana Taylor. His younger sister, Marjorie Tiven, is Commissioner of the New York City Commission for the United Nations, Consular Corps and Protocol.
Bloomberg was a general partner at Salomon Brothers, where he headed equity trading, sales and, later, systems development. He made his fortune with his own company, Bloomberg L.P., selling financial information terminals to Wall Street firms; the company also began a radio network (the flagship station is 1130 WBBR-AM in New York City).
Bloomberg is among the world's richest people. He was ranked 34th by Forbes magazine in its list of 400 Richest Americans in September 2006. He was ranked 142nd in its list of the The World's Billionaires in March 2007. Bloomberg has written an autobiography, Bloomberg by Bloomberg (1997, ISBN 0-471-15545-4).
Bloomberg does not reside in Gracie Mansion, the official mayor's mansion, but at his own home elsewhere on the Upper East Side. He maintains his home address in the white pages and often rides the subway to City Hall. Bloomberg also owns homes in Britain and in the British territory of Bermuda.