Jason Randolph Scheff (born April 16, 1962 in San Diego, California) is an American bassist, singer and songwriter. Since 1985 he has been the bassist and singer for the veteran pop-rock band Chicago. He is the oldest son of well-known session bassist Jerry Scheff, who toured for several years with Elvis Presley. His brothers Darin and Lauren Scheff are also professional musicians. Scheff started his professional musical career in 1982 as a member of a Los Angeles based rock band named Keane (not to be confused with the British band of the same name).