He is a poet and traveller "by the force of things", as he states. Marc’s first poetry collection was published in 1971 titled Memories of the House of Words (prefaced by Aragon) followed by three other books of poems. After his initial success, Marc, refusing "to play the poet", did not publish for twenty years. During this time, he created Les Parvis Poétiques in 1982, The Poetry Forum which organizes events, festivals, acoustic exhibitions, and readings. He worked and researched new methods of poetic expressions connected with modern city life: street performances, and revived poetry alongside music.