Walter Fahrer studied Fine Arts in Buenos Aires before making his professional debut in 1957. He did several cover illustrations for publisher Lainez before he created his first comic, 'Tee Howard', for the same publisher. Afterwards, he illustrated several stories with 'Ernie Pike', with scenarios by Oesterheld, in Hora Cero. In 1959 he was one of the co-founders of the magazine Fuego, where he also started to write his own scenarios again. For the publisher Abril, he drew 'Nat Mandell' in Misterix and Rayo Rojo, and for Divito, he did many short stories.
In the early 1960s he moved to Europe, where started a cooperation with Universo in Milan and eventually the Frech Opera Mundi. Until the mid-1970s, he illustrated numerous daily comics through this agency, including 'Le Roi de Paris', 'Au Fond du Gouffre', 'Les Dames de Croix-Mort', 'La Dame de l'Ouest', 'Lunegarde', 'Les Indes Noires', 'Le Pays d'Où on ne Revient Jamais', 'La Belle de Port-au-Prince', 'Mandrin', 'Lady Stanhope', 'Fournier Sarlovèze', 'Aleonor d'Aquitaine', 'Bataille de Femmes', 'OSS 117', 'AVentures Exotiques' and 'Janique Aimée'.