Gallagher's practice, which started in an old mill-turned-studio, blossomed from a private pursuit to sharing his art with the public when he was approached to hold a solo exhibition, Post Normality Reality Disorder, in 2018. Gallagher has since shown in multiple galleries and art fairs across the UK, and his work is held in private collections world-wide. His paintings and monotypes remain deeply personal explorations of the human condition, and more specifically, his own internal condition, with their engaging use of colour and composition an invitation to reflect on our own state of being.