Roger Casamajor was born in 1976 at the Pyrenees. He started his acting studies in Andorra, and for five years he took part of Somhiteatre theater company, with which he travelled all over Catalunya, acting in plays like The Shawl (David Mamet), A Respectable Wedding (Bertold Brecht), or Farses Medievals.

Roger moved to Barcelona to continue his studies, first at Col.legi del Teatre and then at Institut del Teatre, while he started his first works on films: El Mar (Agustí Villaronga, 1999), Salvajes (Carlos Molinero, 2001) o Guerreros (Daniel Calparsoro, 2001), among others.

After the conclusion of his acting studies, he focused completely in his actor career, working in more than ten films (Nubes de verano, by Felipe Vega; Pan's Labyrinth, by Guillermo del Toro; Pa Negre, by Agustí Villaronga; Henry IV, by Jo Baier; Bestezuelas, by Carles Pastor...), TV series (Mar de Fons, Via Augusta, Ventdelplà, Infidels, Gran Nord...), TV movies (Després de la pluja, Comida Para Gatos, Sincopat, A Mariñeira, Terra Baixa, La Mujer Olvidada...) and theater (El tinent d'Inishmore, Carnaval, Jo Sóc Un Altre, La Nit Més Freda, Pedra de Tartera, La Nostra Classe, Els Baixos Fons, Dispara / Agafa Tresor / Repeteix...)