Seán’s compositions and arrangements have been performed across Canada, the United States, and Europe. He has worked with the Festival du Monde Arabe creating shows of Middle Eastern and North African music and has arranged and composed music for audio books, with story-teller and musician Suzanne De Serres, Youth Program Director for La Nef, and for American author Sandra Gulland. He has been a composer and sound designer for theatre productions as well as provided arrangements for other ensembles and artists, including Camerata Nova (Winnipeg), Chor Leoni (Vancouver), Arion, Palade Musica, Les Voix Humaines, La Mandragore, Pierre Lapointe (all Montreal), Shannon Mercer, I Furiosi (Toronto), Les Voix Baroques, Choeur Louisbourg (Moncton), Cantatica (Pennsylvania), and the Nashville Baroque Orchestra. Other groups he has played with include the Montreal Symphony Orchestra, Ensemble Caprices, Les Boréades, Le Petit Rien.

He has been nominated for numerous OPUS and ADISQ awards and participated in the ADISQ-winning CD, La Traverse Miraculeuse with La Nef and Les Charbonniers de l’enfer. He has won OPUS awards for Creation of the Year (Leave Her, Johnny), Album of the Year (Skye Consort & Emma Björling) and Youth Production of the Year (Le chat et le gondolier, La Nef).