John George Koeltl (ˈkoʊltəl; born October 25, 1945) is a United States district judge of the United States District Court for the Southern District of New York in Manhattan.
Koeltl was born in New York City. He graduated from Regis High School in New York City in 1963. He studied history at Georgetown University, receiving an Artium Baccalaureus degree in 1967. In 1971 he obtained his Juris Doctor from Harvard Law School, where he was an editor of the Harvard Law Review. He served as a law clerk for Judge Edward Weinfeld of the Southern District of New York and then for Justice Potter Stewart of the United States Supreme Court.
From 1973 to 1974, Koeltl served as an assistant special prosecutor for the Watergate Special Prosecution Force, then entered private law practice in New York. For several years, Koeltl was a partner at the New York law firm of Debevoise & Plimpton. During these years, Koeltl served on several committees of the Association of the Bar of the City of New York and American Bar Association and was the author of several published articles on securities law and other topics.
Koeltl was nominated by President Bill Clinton on April 26, 1994, to a seat vacated by Judge Shirley Wohl Kram. He was confirmed by the Senate on August 9, 1994, and received his commission on August 10, 1994.
Koeltl is known for his October 2006 decision to sentence civil rights lawyer Lynne Stewart to 28 months in prison for providing material assistance to a terrorist, her client, 1993 World Trade Center bombing mastermind Omar Abdel-Rahman, by secretly passing messages to his radical followers in Egypt. Koeltl rejected the prosecutors' recommendation of 30 years. The Second Circuit Court of Appeals ordered Koeltl to reconsider whether that sentence was too light and to take into account the government's arguments that she had committed perjury at her trial and abused her position as a lawyer. On remand, Koeltl cited remarks Stewart had made after being sentenced that indicated a lack of remorse. He changed the sentence to 10 years in prison.