Jason alone drew some stories for Djustine, Calavera and other adult comics created and written by Italian author Enrico Teodorani, published in Italy and the United States.
Virus (Big & Rich)(Dope)Lords of Acid(Rock of Ages) Virus switched from Dean Guitars to DBZ Guitars in 2008, he uses the Bird of Prey, Cavallo, Bolero Calavera, and Imperial.
Posada's best known works are his calaveras, which often assume various costumes, such as the Calavera de la Catrina, the "Skull of the Female Dandy", which was meant to satirize the life of the upper classes during the reign of Porfirio Díaz.