Alan Greenspan, former chair of the U.S. Federal Reserve, has died at the age of 100, according to multiple U.S. media reports. Greenspan served as Fed chair for over 18 years, overseeing a period of significant economic growth and navigating several financial crises. He was appointed by President Ronald Reagan in 1987 and continued through the administrations of Presidents George H.W. Bush, Bill Clinton, and George W. Bush. During his tenure, Greenspan became known for his independent and often enigmatic communication style. He is credited by some with successfully managing the U.S. economy through the dot-com bubble and the 9/11 attacks, while others criticize his policies for contributing to the 2008 financial crisis. Details regarding the cause and location of his death have not yet been widely released.