Michael Rubens Bloomberg (born February 14, 1942, in Boston, Massachusetts) is an American billionaire businessman, philanthropist, and politician. He is the founder of Bloomberg L.P., established in 1981 after a career on Wall Street at Salomon Brothers, and revolutionized financial data and media with the Bloomberg Terminal, becoming one of the world's wealthiest individuals. Bloomberg served as the 108th Mayor of New York City from 2002 to 2013, initially as a Republican then as an Independent, focusing on post-9/11 recovery, education reform including charter schools, public health initiatives like the soda ban, and environmental policies. He launched an unsuccessful bid for the 2020 Democratic presidential nomination, spending over $1 billion of his own money. Through Bloomberg Philanthropies, he has donated billions to causes including climate change, gun control via Everytown for Gun Safety, public health, education, and global development. His influence extends through media ownership of Bloomberg News and his role in Democratic politics, including endorsements of Hillary Clinton in 2016 and Joe Biden in 2020. Bloomberg has faced criticism for mayoral policies including aggressive stop-and-frisk policing that disproportionately affected minorities, leading to federal investigations and lawsuits, as well as allegations of fostering a toxic workplace culture at Bloomberg L.P. involving sexual harassment claims, with settlements reported but denied by the company. Despite controversies, he remains a major donor to progressive causes, environmental groups like the Environmental Defense Fund, and anti-gun violence efforts. His net worth is estimated at $109.4 billion as of December 2025.