Born in Bilbao, he studied cello, chamber music and conducting at Bachelor and Masters level in Spain and Holland, where he studied baroque cello at the Royal Conservatory of The Hague and where he was in touch with Anner Bylsma.
Josetxu performs on a regular basis at the most prestigious concert halls in 18 different European countries, the United States, Mexico, Chile, Costa Rica, Bolivia, Japan and China; at venues such as the Concertgebouw Amsterdam, Tokyo Opera City, Centro Nacional de las Artes de México, the Royal Festival Hall London. He has played with some of Europe’s most important ensembles, such as the Royal Concertgebouw Orchestra, and in the context of Early Music with Le Concert des Nations (Jordi Savall), Orchestra of the Age of Enlightenment and as first cellist of L’Arpeggiata (Christina Pluhar), EUBO (European Union Baroque Orchestra) and Arte dei Suonatori, among others.
He has recorded for Virgin, Verso, Arsis, Columna Música and The Gift of Music record labels and also for BBC3, NPS Radio 3 Holland, Mezzo, the Spanish National Radio and TV and the Macedonian TV, among others.
He regularly plays an original Sebastian Klotz cello from 1740, a Tyrolean cello from the early 19th century and a 5-string piccolo violoncello.