Alan Greenspan, who served as Chairman of the U.S. Federal Reserve for 18 years, has died at the age of 100. Throughout his lengthy tenure, Greenspan navigated a period of significant economic fluctuation in the United States, overseeing both periods of substantial growth and several financial crises. He was appointed by President Ronald Reagan in 1987 and continued through four presidential administrations, becoming a central figure in American economic policy. Greenspan’s leadership spanned events like the 1987 stock market crash, the dot-com bubble, and the aftermath of the 9/11 terrorist attacks. His policies and philosophies, often focused on deregulation and monetary policy, remain subjects of ongoing debate among economists. Details regarding the cause of death have not been immediately released.