The chairman of the Board of Governors of the Federal Reserve System is the head of the Federal Reserve, and is the active executive officer of the Board of Governors of the Federal Reserve System. The chairman shall preside at the meetings of the Board. The chairman serves a four-year term after being nominated by the president of the United States and confirmed by the United States Senate; the officeholder serves concurrently as member of the Board of Governors. The chairman may serve multiple terms, pending a new nomination and confirmation at the end of each term, with William McChesney Martin as the longest serving chair from 1951 to 1970 and Alan Greenspan as a close second. The president may not have the legal authority to dismiss a chairman before the end of a term, although this assumption has never been tested in court. The current chairman is Jerome Powell, who was sworn in on February 5, 2018. He was nominated to the position by President Donald Trump on November 2, 2017, and later confirmed by the Senate. He was subsequently nominated to a second term by President Joe Biden, later confirmed by the Senate and sworn in on May 23, 2022.