O'groj graduated from the Beaux-Arts in Angouleme in 1986 and started right after that to illustrate "Pour une poignée de Chamallows". In 1989, he published in the magazine (A suivre) some psychedelic humoristic short stories. Those short stories are gathered in the Casterman book: "Au fil du rasoir". He worked then on cartoons and on comercials, and went back to comic art in 2001, illustrating the series Dragz and the one shot "La semaine des 7 Noel".