Denis had his first solo exhibition in Garter Lane in 2010. And has had work shown in various group exhibitions throughout Waterford and Ireland, including the Winter Quintet show at Greyfriars.
In recent years, Denis has become increasingly infatuated with street art, incorporating spray paint into his studio work. He made his official street art debut with the Tramore Banksy Project in 2019.
Denis is a resident artist at GOMA, and is a co-founder of the Rogue Gallery, Waterford. He is currently working as a tour guide in the new Waterford Gallery of Art.