Alan Greenspan, hailed as the greatest Federal Reserve chairman when he retired in 2006 but derided for a severe financial crisis that followed barely two years later, died on Monday aged 100, NBC News reported. Greenspan, who exerted a powerful influence on the US economy during his tenure at the helm of the Fed from August 1987 to January 2006, died at his home from complications of Parkinson’s disease, NBC reported, citing his wife, Andrea Mitchell, who is the outlet’s chief Washington correspondent. Greenspan oversaw the second-longest economic expansion in US history, an uninterrupted decade of growth from March 1991 to March 2001.