Cass Breen is an Irish artist, born and raised in Dublin. She has lived in London for many years, having completed a fine art degree in the early years after she arrived. She has an MA in Fine Art with distinction from the City & Guilds of London Art School.

Cass was head of faculty for Visual Arts at City Lit in London for 10 years, leading the highly influential department that encompasses the fine and applied arts. Probably the most diverse programme in the adult education sector in London, subjects included drawing, painting and sculpture, digital arts, ceramics, textiles, jewellery, bookbinding, stone carving and many others. She moved on to become Deputy Principal at Morley College in Waterloo where she stayed for 5 years before leaving to focus full time on her art practice. Since then, she has maintained a London studio.