Comer started with tags in 1987, in the Oise, with the group of friends who are still his crew today, OBK, and moved to graffiti for real in 1992. He calls himself an activist more than an artist. His specialty is letters: arriving on tracks already full of black chrome pieces, he chose colour to stand out.

He tells the story of « Paris City Graffiti », the first self-published book on French graffiti: around 300 pages and 2,200 photos. He calculated that the writers in the book and their friends would buy it, priced it at €35 so that as many people as possible could afford it, and called every Fnac store himself, on Monday, Wednesday and Friday. It sold 3,500 copies in a month and a half, and about 7,000 so far.

His second book, « Marqué à vie ! 30 ans de graffiti Vandal », is the first autobiographical account of graffiti. He started writing it after his arrest and the Versailles trial, which lasted 12 years, when the mother of his son handed him a notebook. The book has since been turned into a series script. He also talks about the RATP's long fight against graffiti, the generations who started because of that trial, and the gap between graffiti and what is sold as street art.

Today he lives from several activities: books, commissioned murals, graffiti workshops for children and for autistic people, painting in Guinea, with an agent at his side. With Nikkfurie and Abdallah, he talks about what a digital place could do for graphic artists. His two books and « ART-ATP Ligne 11 » are on his HYK page.