Alan Greenspan, who served as chairman of the U.S. Federal Reserve for nearly two decades, has died at the age of 100. He led the central bank from 1987 to 2006, overseeing significant economic shifts including the dot-com bubble and the 9/11 attacks. Greenspan was known for his influence on monetary policy and his advocacy of deregulation. His tenure saw periods of strong economic growth, but also increasing income inequality and the housing bubble that contributed to the 2008 financial crisis. The cause of death was complications related to Parkinson’s disease. He held a prominent position shaping American and global economies for almost twenty years. His impact on financial markets will continue to be debated for years to come.