Oscar Maximo Fernández began his career in the early 1970s, working together with the artist Daniel Branca. They drew numerous comics for El Clan de Mac Perro, a supplement of the magazine Billiken. After 'Doña Tele', their first collective work with texts by Silvia Bolster, Fernández and Branca drew 'Barbeta y Grunchi' and two episodes of 'Mac Perro'. Together with writer Enrique Pinti, they revived 'El Mono Relojero', one of the initial series of the magazine Billiken. Fernández and Branca cooperated on the magazine Satiricón, for which they produced 'El Sátiro Virgen' with texts by Oskar Blotta in 1972.
Fernández and Branca moved to Barcelona in 1976, where they worked on the series 'Caramelot' and 'Sir Bombin' in the magazines Zipi y Zape and Gaby, Miliki y Fofito of the publishing house Bruguera. Fernández then parted with Branca and began drawing 'Donald Duck' stories for the Danish Disney production of the publishing house Egmont through Studio Recreo between. Fernandez returned to Argentina in 1983.