John David Dingell Jr. was an American politician from the state of Michigan who served as a member of the United States House of Representatives from 1955 until 2015. A member of the Democratic Party, Dingell holds the record as the longest-serving member of Congress in American history.

The dean of the United States House of Representatives is the longest continuously serving member of the House. The current dean is Hal Rogers, a Republican from Kentucky, who has served in the House since 1981. The dean is a symbolic post whose only customary duty is to swear in a speaker of the House after they are elected. This responsibility was first recorded in 1819 but has not been observed continuously – at times, the speaker-elect was the current dean or the speaker-elect preferred to be sworn in by a member of their own party when the dean belonged to another party. The dean comes forward on the House Floor to administer the oath to the speaker-elect, before the new speaker then administers the oath to the other members.