He was born in the town of Toral de los Vados, in the province of León. Completely deaf from the age of six, his parents encouraged him to draw and in 1956, he began to work in a studio in order to learn animation. He emigrated to Cuba in 1959 where he worked in Televisión Cubana and the Instituto Cubano de Arte e Industria Cinematográficos . He also collaborated on some periodicals for children at this time, and later, on comic books and newspaper supplements. Jan returned to Spain in 1969, and worked in the now defunct publishing houseEditorial Bruguera until 1985 where he helped illustrate the work of other comic book artists. In 1973, however, Jan created Superlópez, a parodized version of Superman. It was a series that began as a single page and later expanded into full albums, with adventures involving supervillains and criminal organizations. It also dealt with issues affecting contemporary Spain, namely the illegal drug trade, the transition to democracy post General Franco, etc.. The stories had originally been written by Efepé, but Jan later took over this duty as well. In 1982, Jan worked on the periodical Pulgarcito for Editorial Bruguera, and stopped work on Superlópez in order to do so. However, he decided to abandon this in order to devote himself fully to his creation. Jan's eldest son ended up doing some work on Pulgarcito, but also eventually abandoned this task. In 2014, some of the Pulgarcito books was released again in a new book format. When Editorial Bruguera was shut down in 1985, Jan, together with many other comic book writers, had to do work for other editorial companies. Jan published his first erotic comic 'Laszivia' in Norma Editorial, and created characters such as 'Cab Halloloco' and 'Los ultimos de Villapiñas' for the Jauja comic magazine. The character 'Superioribus', drawn for the editorial Forum, is also a superhero parody. In 1987, Ediciones B began publishing a Superlopez magazine. In this way Jan can continue working on this character till now, with a few other contributions from time to time to other magazines, such as the characters Pum Tarrota or Super Tron.
