Jeffrey David Klein (born July 10, 1960) is a New York State politician and a member of the Democratic Party.
He represented the New York State Senate's 34th District, serving parts of Bronx and Westchester Counties from 2005 to 2018.
Klein also served as Deputy Democratic Conference Leader.Klein served in the New York State Assembly from 1994 until 2004, when he was elected to the New York State Senate.
From January 2011 to April 2018, Klein led the Independent Democratic Conference (IDC), a group of Democratic state senators who formed a separate conference and allied themselves with Senate Republicans.
Klein and his IDC colleagues rejoined the Senate Democratic Conference in April 2018.In January 2018, Klein was accused by a female former staffer of having forcibly kissed her in 2015; Klein denied the accusation and immediately called for an investigation.In the September 2018 Democratic primary election, Klein was defeated by lawyer Alessandra Biaggi in what amounted to a major upset for Klein and his former IDC colleagues.
Klein remained on the general election ballot on a minor party line and was defeated by Biaggi again.