Oliviero Gramaccioni canceled his architecture studies to join the Mangiarano graphic studios. In 1977, he created the character 'Syd Warmur' in the fanzine Comic Art. After a brief appearance in Lanciostory, he rejoined Mangiarano in 1980, doing several jobs for the publishing house Eura. Later on, Gramaccioni went to work for Intrepido and the Acme publications, Mostri and Splatter. In Intrepido, he created the black journalist 'Mara' with scriptwriter Michelangelo La Neve. He is a staff artist of the 'Mister No' series at Bonelli since 1994. He has later also drawn 'Dampyr' and 'Zagor'.