José Espinosa Serrano, who uses the pseudonym Alan Doyer, worked as an agency artist. He is the artist for the popular war comic 'Johnny Comando' from the collection Hazañas Bélicas of the publishing house Toray. A supporting character in 'Johnny Comando' called Gorila became so popular that he became the main character in the series. Eugenio Sotillos provided the pretty humorous scripts.
Also for Toray, he illustrated several comic adaptations novels in the collection Novelas Gráficas Clásicas in 1966, and did the same for Bruguera's collection Joyas Literarias Juveniles ('Un Capitán de quince años', 'El Diablo de la Pradera').