Rajko Milošević a.k.a. Gera and R.M. Guéra is a Serbian comic book author and illustrator. He lives in Barcelona, Spain since 1991.
He debuted in the Yugoslav comic book industry in 1982 with the series Elmer Jones (Serbian Елмер Џонс), a Leonesque western scripted by Dragan Savić. They later collaborated on Texas Riders (Serbian Тексашки јахачи) in 1984.
R.M. Guera's work has been published in Spain, France and the United States. He is working on the Vertigo Comics series Scalped, with writer Jason Aaron, as well as on Le Lièvre de Mars, with writer Patrick Cothias for French publisher Glénat.
Gera is a childhood nickname, and not part of his real name. He changed it to Guéra in the early 1990s when he moved to Barcelona, Spain, to adapt it to Spanish pronunciation.