Leopoldo (or Leopold) Sánchez began his career working for publisher Maga as Gigarpe's assistant in 1963. In 1965 he worked on the collection 'Atletas' also for Maga. Later on he did horror stories for the international agency Bardon Art. Then he did a large number of comics which appeared in France through publisher Aredit. In 1969 he returned to Bardon Art and did war stories for the UK. In the early 1970s, while he was working for this agency, he adapted a part of Cervantes' 'El Quijote' in Spanish magazine Trinca.
In 1974, Sánchez moved to the agency Selecciones Ilustradas and began contributing horror comics to US magazines like Vampirella and Eerie at Warren Publishers. He then worked for Marvel, where he worked on 'Frankenstein'.
Since 1975, Leopoldo Sánchez did several works in his native Spain: he did humorous comics for magazine Eh!, literary adaptations, a history of Catalunya, a serial about the Royal Family and, most remarkably, his 'Bogey' (1981) This self-published book was the beginning of a homonymous series about a private detective in a future world. The following episodes went through magazines Cimoc and K.O.Comics before being compiled in 'Archivo Secreto del Comisario Kelele' and 'Nunca Jamás'. This series and the ephemeral ones 'El Justiciero Enmascarado' (1983) and 'Diario de Arena' (1984) were written by Antonio Segura. Leopoldo Sánchez is also active as a painter and his work has been exhibited internationally.