Mullen is an artist whose practice encompasses performance, experimental video, sound work and sculpture. Her live work is often concerned with spaces of poetic resistance and metamorphosis. Since the mid-90s she has presented her work at major international festivals and exhibitions in the UK, Europe, North and South America, New Zealand and the Arctic.
Mullen currently works as a lecturer in Fine Art at the Belfast School of Art, where she also co-curates the Belfast International Festival of Performance Art.