Rush Dew Holt, Jr. (born October 15, 1948, Weston, West Virginia) is an American Democratic Party politician and the current U.S. Representative for New Jersey's 12th Congressional District. He is currently the only Quaker in the Congress and one of only a few dozen members of Congress who have a PhD.
Rush D. Holt was born to Rush D. Holt Sr., who served as a United States Senator for West Virginia (1935–1941), and his wife Helen Holt, the first woman to be appointed West Virginia Secretary of State (1957–1959). Holt Sr. was the youngest person ever to be popularly elected to the U.S. Senate, at age 29. He died of cancer when Rush was six years old.
Holt graduated with a BA degree in physics from Carleton College in Minnesota, and holds MS and PhD degrees in physics from New York University. The title of his doctoral dissertation is "Calcium absorption lines and solar activity: a systematic program of observations" and is available from University Microfilms International as document number 8127915.