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George Mraz (born Jiří Mráz; 9 September 1944 – 16 September 2021) was a Czech-born American jazz bassist and alto saxophonist. He was a member of Oscar Peterson's group, and worked with Pepper Adams, Stan Getz, Michel Petrucciani, Stephane Grappelli, Tommy Flanagan, Jimmy Raney, Chet Baker, Joe Henderson, John Abercrombie, John Scofield, and Richie Beirach, among others.
During the 1970s, he was a member of the New York Jazz Quartet and The Thad Jones/Mel Lewis Orchestra, and in the 1980s a member of Quest. He also appeared with Joe Lovano, Hank Jones and Paul Motian on Lovano's records I'm All For You and Joyous Encounter.
Mraz died on September 16, 2021, in Prague. The immediate cause of death was undisclosed, though he had battled pancreatic cancer in 2016.