He was educated at Ysgol Maes Garmon in Mold,[3] and Aberystwyth University's Department of Theatre, Film and Television Studies.

[1] Best known for playing Alfie Butts in the BBC sitcom My Family, Meilir has also appeared in a number of popular television shows such as Afterlife and Terry Pratchett's Hogfather on Sky One.

He is well known on Welsh television for his roles in an extensive range of shows including Y Pris, Caerdydd, Teulu, Tipyn o Stad, Cyw and Y Gwyll.

He played the lead role of Trefor the taxi driver in Gwlad yr Astra Gwyn, for which he received a BAFTA Cymru nomination as best actor in 2013, and was the original Rapsgaliwn.

"[4] In 2023, he starred in the black comedy Pren ar y Bryn on S4C, later shown in English on BBC One as Tree on a Hill.