Alan Greenspan (/ˈælən ˈɡriːnspæn/; born March 6, 1926) is an American economist who served five terms as the 13th chair of the Federal Reserve in the United States from 1987 to 2006. He works as a private adviser and provides consulting for firms through his company, Greenspan Associates LLC. First appointed Federal Reserve chairman by President Ronald Reagan in August 1987, he was reappointed at successive four-year intervals until retiring on January 31, 2006, after the second-longest tenure in the position (behind William McChesney Martin).