Osvaldo Reyes studied medicine at the University of Panama, and later specialized in Gynecology and Obstetrics. He is in charge of the Department of Obstetrics at the University of Panama, and is a member of the National System of Researchers. He is a fervent reader and writer of the noir genre, in which he has published to date ten novels (The Machiavelli Effect, On the Threshold of Hades, Death Penalty, The Stake on the Cross, Sacrifice, Song of the Seagulls, The Wooden Cactus, Murder in Portobelo , The Machiavelli Experiment, The Staff and the Snake) and three short-story collections (Thirteen Drops of Blood, Thirteen Candidates for a Homicide and Thirteen Crimes Panamanian-style with Patacones and Coffee). He is the winner of the First Short Story Prize of the 2017 Panama Horror Film Fest, the 2002 Bruma Negra International Award (Spain), and the 2022 Lloret Noir International Award (Spain).