For a long time he worked in advertising and later he arrived in Madrid with all the intentions of becoming an actor, studying acting at the theater school. Cristina Rota.
It was in 2005 when he began to participate in a television series, success would come from the hand of the police soap opera Paco’s men, which would be like a springboard to act in other series like Things with Sms, No fear of dreaming Y Boat.
His first cinematographic role was that of Moratalla in the film of Antonio Banderas “The Way of the English” (2006).
But Mario’s talent also reached the producers and film company, debuting on the big screen with the comedy Brain drain filmed in 2009, this film became one of the highest grossing in Spanish cinema. That same year, he was also able to shoot Fat Lies.
For the following year, it was considered in 3 meters above the sky, a romantic film based on a novel by Federico Moccia. Months later he recorded Carne de Neón, where he gave life to Ricky, a young adventurer who decides to open a brothel.
This young actor has been romantically linked with several Spanish actresses, some of his best-known relationships being the one he had with Amaia Salamanca, and later with the actress Clara Lake. He has been the boyfriend of another actress named Maria Valverde, and his most recent work in the cinema was the one he did in 2012 titled Group 7, where he played the role of a young policeman sharing credits with Antonio de la Torre.
Casas has many other projects for the future within Spanish cinema and is looking for the opportunity to become an international actor, in order to reach Hollywood.