Title: List of speakers of the United States House of Representatives
Content:  speaker, James K. Polk, subsequently served as President of the United States, the only one to serve in both offices, and two speakers, Schuyler Colfax and John Nance Garner, later became Vice president. The longest serving speaker was Sam Rayburn – 17 years, 53 days. Elected 10 times, he led the House three times: from September 1940 to January 1947; January 1949 to January 1953; and January 1955 to November 1961. Tip O'Neill had the longest uninterrupted tenure as speaker – 9 years, 350 days. Elected five times, he led the House from January 1977 to January 1987. Theodore M. Pomeroy had the shortest tenure; elected speaker on March 3, 1869, he served one day.
Title: Robert Byrd
Content:  Byrd was elected to a record ninth consecutive full Senate term on November 7, 2006. He became the longest-serving senator in American history on June 12, 2006, surpassing Strom Thurmond of South Carolina with 17,327 days of service. On November 18, 2009, Byrd became the longest-serving member in congressional history, with 56 years, 320 days of combined service in the House and Senate, passing Carl Hayden of Arizona. Previously, Byrd had held the record for the longest unbroken tenure in the Senate (Thurmond resigned during his first term and was re-elected seven months later). He is the only senator ever to serve more than 50 years. Including his tenure as a state legislator from 1947 to 1953, Byrd's service on the political front exceeded 
Title: John Dingell
Content:  1955; his father had held the seat for 22 years. He left office on January 3, 2015. Having served for over 59 years, he has the longest congressional tenure in U.S. history. Together with Jamie Whitten and Joseph Gurney Cannon, he served in the House under more presidents than anyone else: 11. He was also the longest-serving Dean of the U.S. House of Representatives and Dean of the Michigan congressional delegation. Dingell was one of the final two World War II veterans to have served in Congress; the other was Texas Representative Ralph Hall, who also left Congress in 2015. During his time in Congress in addition to protecting the 
Title: List of members of the United States Congress by longevity of service
Content:  The 90th Congress was notable because for a period of 10 days (December 24, 1968 – January 3, 1969), it contained within the Senate, all 10 of what was at one point the top 10 longest-serving senators in history (Byrd, Inouye, Thurmond, Kennedy, Hayden, Stennis, Stevens, Hollings, Russell Jr., and Long) until January 7, 2013, when Patrick Leahy surpassed Russell B. Long as the 10th longest-serving senator in history. This period stretched from the appointment of Ted Stevens of Alaska to fill a vacancy to the retirement of Carl Hayden of Arizona early the next year. The 99th Congress (1985–1987) was the period in which most people from this list were serving together (all but Hayden, Russell Jr., Warren, Eastland, and Magnuson).
Title: John Dingell
Content:  John David Dingell Jr. (July 8, 1926 – February 7, 2019) was an American politician who served as a member of the United States House of Representatives from 1955 until 2015. A member of the Democratic Party, he holds the record for longest-serving member of Congress in American history, representing Michigan for more than 59 years. He most recently served as the representative for Michigan's 12th congressional district. A longtime member of the House Energy and Commerce Committee, Dingell was the chairman of the committee from 1981 to 1995 and 2007 to 2009. Dingell began his congressional career by succeeding his father, John Dingell Sr., as representative for on December 
Title: John Dingell
Content:  v. Bush) was ultimately dismissed for lack of standing. After winning re-election in 2008 for his 28th consecutive term, Dingell surpassed Whitten's record for having the longest tenure in the House on February 11, 2009. In honor of the record, Michigan Governor Jennifer Granholm declared February 11, 2009, to be John Dingell Day. On June 7, 2013, Dingell became the longest serving member of Congress, surpassing the late Senator Robert Byrd's combined House and Senate service of 20,995 days. By the time Dingell retired on January 3, 2015, he had served 21,571 days in Congress, all of it in the House of Representatives. As of January 3, 2015, Dingell had served with 2,453 different U.S. Representatives in his career.
Title: Jamie Whitten
Content:  years and two months). He retired to his home in Oxford, Mississippi and died there on September 9, 1995, aged 85, eight months. His service from November 4, 1941, to January 3, 1995 set a record for length of service in the House, which remained unbroken until February 11, 2009, when Michigan Congressman John Dingell surpassed it. Whitten is also the List 5th longest-serving Congressman (House and/or Senate) behind Daniel Inouye, Carl T. Hayden, Robert Byrd and John Dingell. Throughout most of his tenure in the House, Whitten served on the Appropriations Committee, ultimately serving as Chairman from the 1979 retirement of George H. Mahon until newly-elected Democrats in the House Democratic Caucus removed him in favor of William 
Title: Dean of the House
Content: Dean of the United States House of Representatives ; Dean of the House (Canada), the dean in the Canadian House of Commons The Dean of the House is, in several legislatures, the member with the longest unbroken record of service. Specific examples include: The Dean of the House of Representatives in the United States is Don Young, a Republican from Alaska serving since March 6, 1973.
Title: John Conyers
Content:  of the vote against Republican nominee Don Ukrainec. In 2013, his district was renamed as the 13th district. In total, Conyers won re-election twenty-five times and was serving in his twenty-sixth term. He was the dean of the House as longest-serving current member, the third longest-serving member of the House in history, and the sixth longest-serving member of Congress in history. He was the second-longest serving member of either house of Congress in Michigan's history, trailing only his former boss, Dingell. He was also the last member of the large Democratic freshman class of 1964 who was still serving in the House. In May 
Title: Records of members of parliament of the United Kingdom
Content:  1908 and between 1922 and 1924. Charles Pelham Villiers was the longest continuously serving MP. He was elected in 1835 and remained an MP continuously for over 62 years until his death on 16 January 1898, aged 96 years 13 days. Since the start of the 20th century, the longest continuous service by an MP has been 51 years 80 days by Edward Heath, who sat from 1950 to 2001. The longest continuous service record for a female MP is held by Harriet Harman, first elected in October 1982. The longest total service record for a female MP is held by Dame Margaret Beckett, who served for 4 years and 7 months between 1974 and 1979 and was then re-elected in June 1983. Beckett also holds the record for the longest span of service for a woman.

Question: who is the longest serving member of the house in history?
Answer: John Dingell.