Alan Greenspan, who served as Chairman of the U.S. Federal Reserve for over 18 years, has died. The influential economist had been living with Parkinson’s disease. Greenspan led the Fed through multiple economic cycles, including the dot-com bubble and the 9/11 attacks. He was known for his monetary policy and advocacy of deregulation. Appointed by President Ronald Reagan in 1987, he continued under Presidents George H.W. Bush and Bill Clinton, and was later reappointed by President George W. Bush. His tenure saw significant economic growth but also increasing income inequality, a topic of later debate regarding his policies. Details regarding memorial arrangements have not yet been released.