Career
From October 1968, Gwynfryn fronted Helo Sut Dach Chi?, the first dedicated Welsh language popular programme on the radio. He has been with the Welsh-language radio station Radio Cymru since its inception, presenting shows such as Helo Bobol, Hywel a Nia, and presenting annually from the Eisteddfod. Alongside his radio career, Gwynfryn has also presented television shows such as Heddiw and Rhaglen Hywel Gwynfryn.
Gwynfryn has also written four pantomimes, including Jiw Jiw Jeifin Jenkins, as well as writing a film for the Welsh-language television station S4C.