Based in Dartmouth, Nova Scotia, Jon-Paul Décosse has been described by Opera Canada as having a "powerful, full-throated bass-baritone". An alumnus of the Canadian Opera Company Ensemble Studio, Jon-Paul's favourite COC roles include Sam in Leonard Bernstein's Trouble in Tahiti, Schaunard in La bohème, Sciarrone in Tosca, and Don Alfonso in Cosi fan tutte. Other memorable appearances across Canada include Colline in La bohème (Edmonton Opera, Opera Hamilton, Calgary Opera), Leporello in Don Giovanni (Opera Nova Scotia), and the title role in Verdi's Falstaff (Opera NUOVA, Highlands Opera).

Since relocating to Nova Scotia, Jon-Paul has invested his talents locally, debuting with Symphony Nova Scotia for Handel's Messiah, performing title roles in The Mikado and Noye's Fludde with Maritime Concert Opera, and appearing as Captain von Trapp in Broadway Atlantic's inaugural production of The Sound of Music. Recently, JP had the pleasure of acting as a mentor for the Fountain School of the Performing Arts, while also appearing as Papageno in their 2017 production of The Magic Flute.