Question: Who did the 39th Vice President of the United States serve under?

Passages:
Gerald Rudolph Ford Jr. (born Leslie Lynch King Jr.; July 14, 1913 – December 26, 2006) was an American politician who served as the 38th President of the United States from August 1974 to January 1977, following the resignation of Richard Nixon.  Prior to this he served eight months as the 40th Vice President of the United States, following the resignation of Spiro Agnew.  He was the first person appointed to the vice presidency under the terms of the 25th Amendment, and consequently the only person to have served as both Vice President and President of the United States without being elected to executive office.  Before his appointment to the vice presidency, Ford served 25 years as U.S. Representative from Michigan's 5th congressional district, the final nine of them as the House Minority Leader. The 1960 presidential campaign of John F. Kennedy, a United States Senator from Massachusetts, began on January 2, 1960, when Kennedy formally announced his candidacy for 35th President of the United States, replacing incumbent President of the United States Dwight D. Eisenhower.  Kennedy was nominated by the Democratic Party at the Democratic National Convention of 1960, taking place between July 11 and July 15, 1960.  On July 15, 1960, Kennedy named Senator Lyndon B. Johnson of Texas as his official running mate.  Kennedy and Johnson won the election on November 8, 1960, defeating incumbent Vice President and Republican nominee Richard Nixon, who would later go on to be the 37th President of the United States.  Kennedy and Johnson were sworn in as 35th President and 37th Vice President of the United States on January 20, 1961 respectively.  Kennedy would serve as President of the United States until his death in November 1963. Spiro Theodore "Ted" Agnew ( ; November 9, 1918 – September 17, 1996) was the 39th Vice President of the United States, serving from 1969 to 1973.  He was the second – and most recent – vice president to resign the office, though unlike John C. Calhoun in 1832, Agnew left office in disgrace. Germán Vargas Lleras (born February 19, 1962) is a Colombian politician who recently served as the 25th Vice President of Colombia under President Juan Manuel Santos Calderón.  A member of the Radical Change political party, he served four consecutive terms in the Senate, having been elected in 1994.  German Vargas also served in the Cabinet as the Minister of Interior and then as the Minister of Housing, City and Territory.  He was elected Vice President of Colombia in 2014, running alongside Juan Manuel Santos who was seeking re-election for a second term as President.  On the 15th of March 2017, Vargas Lleras resigned as Vice President in order to be eligible to run for President in the 2018 Presidential elections. The president pro tempore of the United States Senate ( or ), also president pro tem, is the second-highest-ranking official of the United States Senate.  of the United States Constitution provides that the Vice President of the United States is, despite not being a senator, the President of the Senate, and mandates that the Senate must choose a president "pro tempore" to act in the Vice President's absence.  Unlike the vice president, the president pro tempore is an elected member of the Senate, able to speak or vote on any issue.  Selected by the Senate at large, the president pro tempore has enjoyed many privileges and some limited powers.  During the vice president's absence, the president pro tempore is empowered to preside over Senate sessions.  In practice, neither the vice president nor the president pro tempore usually presides; instead, the duty of presiding officer is rotated among junior senators of the majority party to give them experience in parliamentary procedure. In 1973, Republican Vice President Spiro Agnew was forced to resign following a controversy over his personal taxes.  Under the terms of the 25th Amendment, a vice presidential vacancy is filled when the president nominates a candidate who is confirmed by both houses of Congress.  Republican President Richard Nixon thus had the task of selecting a vice president who could receive the majority support of both houses of Congress.  Nixon considered selecting former Texas Governor John Connally, New York Governor Nelson Rockefeller, and California Governor Ronald Reagan.  However, Nixon settled on House Minority Leader Gerald Ford of Michigan, who was popular among the members of Congress and who was good friends with Nixon.  Ford won the approval of both houses by huge margins, and was sworn in as the 40th Vice President of the United States on December 6, 1973.  In 1974, Ford ascended to the presidency after the Watergate scandal led to the resignation of President Nixon. The presidency of Gerald Ford began on August 9, 1974, when Gerald Ford became President of the United States, and ended on January 20, 1977, a span of days.  Ford, the 38th United States president, succeeded Richard Nixon, who had resigned from office.  Prior to this he was the 40th Vice President of the United States, serving from 1973 until President Richard Nixon's resignation in 1974.  He was the first person appointed to the vice presidency under the terms of the Twenty-fifth Amendment to the United States Constitution, following the resignation of Vice President Spiro Agnew on October 10, 1973.  Ford has the distinction of being the first, and to date the only person to have served as both vice president and president without being elected to either office. John Nance Garner IV (November 22, 1868 – November 7, 1967), known among his contemporaries as "Cactus Jack", was an American Democratic politician and lawyer from Texas.  He was the 39th Speaker of the United States House of Representatives from 1931 to 1933.  He was also the 32nd Vice President of the United States, serving from 1933 to 1941.  Along with Schuyler Colfax, Garner is one of two individuals to serve as Vice President of the United States and Speaker of the United States House of Representatives. The Ninety-third United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives.  It met in Washington, DC from January 3, 1973, to January 3, 1975, during the end of Richard Nixon's presidency, and the beginning of Gerald Ford's.  This Congress was the first (and, to date, only) Congress with more than two Senate Presidents (the Vice President of the United States), in this case, three.  After the resignation of Spiro Agnew, Gerald Ford was appointed under the authority of the newly ratified 25th Amendment.  Ford became President the next year and Nelson Rockefeller was appointed in his place.  The apportionment of seats in the House of Representatives was based on the Nineteenth Census of the United States in 1970.  Both chambers had a Democratic majority. Elinor Isabel "Judy" Judefind Agnew (April 23, 1921 – June 20, 2012) was the Second Lady of the United States from 1969 to 1973.  She was the wife of the 39th Vice President of the United States, Spiro Agnew, who also served as Governor of Maryland.

Supporting sentences:
 This Congress was the first (and, to date, only) Congress with more than two Senate Presidents (the Vice President of the United States), in this case, three.  After the resignation of Spiro Agnew, Gerald Ford was appointed under the authority of the newly ratified 25th Amendment. Spiro Theodore "Ted" Agnew ( ; November 9, 1918 – September 17, 1996) was the 39th Vice President of the United States, serving from 1969 to 1973.