Who produced the CBS “rural sitcoms” of the 1960s “The Beverly Hillbillies” (1962-71), “Petticoat Junction” (1963-70), and “Green Acres” (1965-71)?

Paul Henning produced the CBS “rural sitcoms” of the 1960s including “The Beverly Hillbillies” (1962-71), “Petticoat Junction” (1963-70), and “Green Acres” (1965-71)?.