Andrés G. Leiva (Córdoba, 1969). Has a degree in Fine Arts, and has been working for 25 years as an art teacher. He is the author of comics such as Juana de Arco (Joan of Arc), Serie B and Uno de esos días (One of Those Days). 15 is his first graphic novel with writer David Muñoz.

David Muñoz (Madrid, 1968) studied fine arts and, like many other comics writers, is a frustrated comic artist. Even today, he dreams of one day drawing a graphic novel by himself. Has worked in films such as El espinazo del diablo (The Devil's Backbone) or La posesión de Emma Evans (Exorcismus); series such as La valla (The Barrier) and La embajada THeEmbassy); comics such as La casa de los susurros (The House of Whispers), Trackers, Miedo (Fear), and in the comic script manual Escribir en viñetas, pensar en bocadillos (Writing in Vignettes, Thinking in Speech Bubbles). With Rayco Pulido, he is the author of Sordo (The (Silent) War), also made into a film. His latest graphic novels are 15, with artist Andrés G. Leiva, and Infectado (Infected), with Manuel Meseguer, both published by Astiberri.