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.Scheff was a graduating member of the Class of 1980 at San Diego's Point Loma High School.