Ronan was born and raised in Edinburgh. He attended the Musical Theatre course at the Dance School of Scotland before graduating from Arts Educational Schools, London with a BA Honors degree. Theatre work includes: West Side Story (Leicester Curve), Titanic (European Tour), Kiss Me Kate and Annie Get Your Gun (Sheffield Crucible), Me And My Girl (Chichester Festival Theatre), 42nd Street (Theatre Royal, Drury Lane) and Bugsy Malone (Lyric Hammersmith).