Seiriol Davies trained at LISPA. He is the writer, composer and lead of How to Win Against History, which opened at Edinburgh Fringe 2016 then toured England and Wales before a run at London's Young Vic.

Recent work includes the interactive epic Mission Control with National Theatre Wales and Hijinx (associate artist, script, performer); Corn Gwlad, a Welsh-language queer musical with Cwmni Pluen, Stonewall Cymru and the National Eisteddfod of Wales (co-writer, lyricist, composer, performer); Effigies of Wickedness: Songs Banned by the Nazis with Gate Theatre and English National Opera (lyricist). Seiriol wrote the musical finale to The Greatest Wealth, The Old Vic's celebration of the NHS.

He created Mess with Caroline Horton & Co, which has toured extensively nationally and internationally since it premiered in 2012. He has made work with Punchdrunk, Verity Standen, Kristin Fredricksson, Rififi, Giant Bird, Beatabet, Underbling & Vow, Christopher Green, Gideon Reeling and others.

He is currently co-writing a musical with Maxine Peake, to be directed by Sarah Frankcom.

Awards include The Stage Award for Acting Excellence, a Wales Theatre Award, a Broadway Baby Bobby Award and the Oxford Samuel Beckett Theatre Trust Award. He was nominated for a 2018 UK Theatre Award for ‘Best Performance in a Musical’.