Berwyn is from Pontypridd and trained at the Central School of Speech and Drama.
Theatre credits include: Woof - Sherman, Golygfeudd o'r Pla Du - Theatrau Sir Gâr, Exodus - Motherload Theatre, Little Dogs - Frantic Assembly/NTW, Tonypandamonium - NTW, Sweeney Todd - WNO/West Yorkshire playhouse, Deffro’r Gwanwyn/Pan oedd y byd yn fach - Theatr Genedlaethol, Sky Hawk - Theatr Clwyd.
TV/Film credits include: Bad Soil, Smile, Bang, Merched Parchus, Pobl Y Cwm.
Berwyn also sings with Hamburg based vocal group Gregorian.