Alfonso was member of the Orchestra Mozart in Bologna (Italy) under the baton of Claudio Abbado and the West-Eastern Divan Orchestra, conducted by Daniel Barenboim.
He has worked as principal trumpet with the Duisburger Philharmoniker (Deutsche Oper am Rhein) and the Mannheim Nationaltheater Orchester in Germany. He has played regularly with different orchestras, including his appearences as guest principal trumpet with the Royal Concertgebouw Orchestra in Amsterdam, the Rotterdam Philharmonic, the Royal Scottish National Orchestra, the KBS Symphony Orchestra in Seoul-Korea, the Freiburg Baroque Orchestra, and the National Orchestra of Belgium among many others.
After being appointed principal trumpet at the Brussels Philharmonic in Belgium, from 2018, he holds the same position at the Orchestra dell´Accademia Nazionale di Santa Cecilia in Rome. He also teaches at the Conservatory “Musikene” in San Sebastián (Spain).