Born in Barcelona, he studied with Francesc Solà, Lluís Claret and Radu Aldulescu.

He continued his studies in London with William Pleeth and later at the New England Conservatory in Boston with Bernard Greenhouse.

From 1986 to 1989 he was a member of the European Union Youth Orchestra, touring the world under the baton of Abbado, Leinsdorf, Mehta, Inbal, Azkenhazy and others.

He has been invited to lead the cello sections of the orchestras of the Liceo, Barcelona, Tenerife, Galicia, Granada, Filarmónica de Medellín and Nacional de Santo Domingo.

He has also toured the USA, South East Asia, Japan, South Africa, Germany and Italy leading the cellos sections of the Cadaqués Orchestra and the New European Strings.

He was invited by the JONDE, JONC, Simón Bolívar de Caracas, Filarmónica de Medellín and Nacional de Sto. Domingo to train their young cellists.

Parallel to his orchestral and teaching activity, he develops an intense activity as soloist and chamber musician, playing as soloist under the baton of Lionel Bringuier, Alejandro Posada, etc, and collaborating in chamber music with musicians such as Jean Bernard Pommier, Johannes Moser, David Grimal, Gerard Caussé, Bella Davidovich, Asier Polo, Joan Enric Lluna, Ludwig Mueller, etc.

He has performed in the chamber music cycles of the Opéra de la Bastille in Paris, the Slösh Laudon Festival in Vienna, the Santo Domingo Festival in the Dominican Republic and the Festival del Sole de Cortona in Italy, playing with Dimitri Sitkovetsky, Phillipe Entremont, Thomas Selditz and the Aron Quartet of Vienna.

He has recorded Korngold’s Sextet with Thomas Selditz and the Aron Quartet of Vienna as well as Granados’ trio and quintet with Jean Bernard Pommier and the soloists of the Cadaqués Orchestra. He has also recorded Beethoven’s Triple Concerto with Jennifer Moreau, Judith Gordon and the OSCyL.

Marius Díaz is a member of the Ocean Drive Quartet, the Band Art Orchestra led by Gordan Nikolic and cello soloist with the Cadaqués Orchestra.

Since 1991 he has been the cello soloist of the Orquesta Sinfónica de Castilla y León and since 2002 Professor at the Conservatorio Superior de Salamanca.

Màrius plays the Ex-Trotta cello made in Paris by Charles Adolph Maucotel circa 1850.