1966- The Art Gallery of Ontario, Ontario Society of Artists, Group show, Toronto, ON.
1966- Sarnia Art Gallery, Group show, Sarnia, ON.
1966- Kitchener/Waterloo Gallery, Group show
1966- 26th Annual Western Ontario Exhibition, Group show, London Art Gallery, London ON
1967- The Art Gallery of Ontario, Ontario Society of Artists, Group show, Toronto ON
1972- Althouse College, Two-man show, University of Western, London ON
1980- Hazelton Lanes Gallery, Group Show, Toronto ON
1981- Pagurian Gallery, Group Show, Toronto ON
1984- Windsong Galleries, Group show, Mississauga ON
1985- Pagurian Gallery, One-man show, Toronto ON
1987- Kasper Gallery, Group show, Toronto ON
1987- Market Gallery, Art in Architecture, Toronto ON
1988- Halton Hills Cultural Centre, One-man show
1990- At the Artist’s Home, Toronto ON
1991- John Aird Centre, Wilfred Laurier University, Waterloo ON
1992- Swann Gallery, Stratford ON
1992-2014- Stone Church Museum of Art Permanent Display
Dennis relocated out of Toronto and opened The Stonechurch Museum of Art in Belleville Ontario. This became home for the artist and a place to permanently display his collection of paintings.
He hosted a number of shows at the Stonechurch over the years, where he showcased talented musicians and dancers alongside his new artworks. These shows became quite popular in amongst his followers and a way that he could generate income and continue living his dream-painting the Lovers uninterrupted in the sanctuary that he had created for himself. Dennis did this successfully until he passed away unexpectedly in 2014.
2016- John B Aird Gallery, Toronto ON. Group Show
The Museum Of The Street: 50 Years of Toronto Illustration.