abstract:George Mraz (born Jiří Mráz on 9 September 1944 in Písek, Protectorate of Bohemia and Moravia, now Czech Republic) is a jazz bassist and alto saxophonist. He was a member of Oscar Peterson's group, and has worked with Pepper Adams, Stan Getz, Michel Petrucciani, Stephane Grappelli, Tommy Flanagan, Jimmy Raney, Chet Baker and many other important jazz musicians.