Martin is a French public artist, stimulating debate in public space to promote positive social change. He uses language to engage directly with the public, promoting constructive dialogues, usually about marginalisation, equality and more equitable social organisation, with the aim of making the world more humane. He has worked with large scale projection, digital billboards, video, graffiti, portraiture and live performance, creating notable projects with The National Gallery, The Royal Opera House, Tate Britain, Twentieth Century Fox, The National Theatre, and the Household Division of the British Army. He is the only artist to have projected a contemporary artwork onto the dome of St Paul's Cathedral in London - twice. He was public artist in residence with the British Army and at St Paul’s Cathedral, and is currently artist in residence at media company Clear Channel UK with access to one of the UK’s largest networks of digital billboards. He has been described in the Guardian as "one of the capital’s most influential public artists".