The influential former Federal Reserve chair Alan Greenspan has passed away at the age of 100 due to complications from Parkinson's Disease.Serving under four presidents from 1987 to 2006, he navigated historic economic events including the 1987 market crash and the dot-com bubble.While celebrated for managing the Great Moderation, his legacy is complicated by criticisms regarding deregulation and its connection to the 2008 financial crisis.