Santiago Martínez Cartier was born in Buenos Aires in 1992. He defines himself as a science fiction writer. He has six novels published since 2014 to date. He edits books and produces events as part of Criolla Editorial. He produced the audiobook El quinto peronismo in radio theater format, an adaptation of his novel of the same name. He writes the newsletter Picnic sideral for the media Mate. Palermo Dead (2021), a series of horror stories set in a cursed building built over the Chacarita Cemetery, is his latest fiction book. Last year he published Picnic sideral: Algo en qué creer, an improved selection of the best newsletters of 2022, in a co-production between Mate and Criolla. The Stranger (or El Pamperon't), co-directed with Miguel Tapia, is his first film.

Filmography