Born in Madrid, Spain, his works have premiered at Cannes, San Sebastián, IDFA, among other festivals, and have won two Goya awards. His short film ‘Aunque es de Noche’ (2023) premiered in the Festival de Cannes Official Selection, being nominated for the Short Film Palme d’Or, won the Goya for Best Short Fiction Film, and was part of the Official Selection at the César 2025. Also at the Festival de Cannes in 2023, he premiered his short film ‘As Gaivotas Cortam o Céu’ at the Quinzaine des Cinéastes. His short film ‘Lo-Tech Reality’ (2022), a result of his collaboration with the Detroit techno collective Underground Resistance, continues its journey through international festivals and museums after premiering at Zinebi and Ann Arbor. His first fiction feature film ‘Ciudad Sin Sueño’ (2025) will be premiered in Cannes at La Semaine de la Critique. In 2020, Guillermo received the prestigious Princess of Girona Award for Arts and Literature.