Patrick Joseph Leahy is an American politician and attorney who served as a Democratic U.S. Senator from Vermont from 1975 to 2023, making him the longest-serving senator at retirement and one of the longest-serving senators in U.S. history. Born on March 31, 1940, in Montpelier, Vermont, to an Irish Catholic family, he grew up in the state and developed an early interest in public service. He earned a Juris Doctor from Georgetown University in 1964 and returned to Vermont to enter private legal practice. In 1966, he was appointed as Vermont's U.S. Attorney, and later served as Chittenden County's state's attorney from 1967 to 1974. Elected to the Senate in 1974 at age 34, Leahy focused on issues like criminal justice reform, environmental protection, technology policy, judiciary, agriculture, and foreign policy, where he was particularly influential. He was a key figure in intelligence and justice legislation, chairing the Senate Judiciary Committee from 2001 to 2005 and again from 2009 to 2015, and also chaired the Senate Appropriations Committee. He served as president pro tempore of the Senate from 2012 to 2015 and from 2021 to 2023, briefly assuming the role of acting president during transitions. Throughout his career, Leahy was a vocal advocate for surveillance reform, animal rights, international human rights, and diplomacy, co-sponsoring key legislation such as the Leahy Law, which prohibits U.S. aid to foreign security forces implicated in human rights violations. He played a significant role in the impeachment trials of Presidents Bill Clinton and Donald Trump, and was known for his bipartisan efforts on issues like disability rights and agricultural policy benefiting Vermont's rural economy. Leahy married Marcelle Pomerleau in 1960, and the couple raised three children. Retiring in 2023, he remains an influential figure in Democratic politics and Vermont affairs, with a legacy marked by his commitment to constitutional principles and progressive causes.