He studied piano with Alessandro Commellato, Andrzej Tatarski, Pier Narciso Masi and Contemporary Music with Maria Grazia Bellocchio, Emanuele Arciuli. Gaston Polle Ansaldi has performed, mainly as a chamber musician and as an ensemble pianist, in important venues such as Teatro alla Scala (Ridotto dei palchi “A. Toscanini”), Auditorium Parco della Musica, Piccolo Teatro di Milano, Accademia Filarmonica Romana, Academia Chilena de Bellas Artes in Santiago del Cile, Circolo della Stampa of Torino, Stresa Festival, Festival Aperto of Reggio Emilia, Mantova Chamber Music Festival, Stagione Rondò - Divertimento Ensemble, Festival Trieste Prima, Fondazione William Walton, Gaudete – Festival Internazionale di Musica Antica of Varallo Sesia, Cremona Mondo Musica. Gaston Polle Ansaldi was the pianist of Ensemble Giorgio Bernasconi (Accademia Teatro alla Scala), with which he’s still collaborating. Among the most significant performances, the first absolute performance of Luca Mosca's opera "La cortina di gala", the first Italian performance of Frank Zappa's The Yellow Shark. As a soloist, he played Hugues Dufourt's L'Amérique d'après Tiepolo, Alban Berg's Kammerkonzert in duo with violinist Lorenzo Gentili Tedeschi (MDI Ensemble). As an orchestral musician he also collaborated with Orchestra dell’Accademia del Teatro alla Scala, Orchestra del Teatro Petruzzelli di Bari, Orchestra Sinfonica Siciliana; he was directed by David Coleman, Dennis Russell Davies, Maxime Pascal, Peter Rundel, Marco Angius, Tito Ceccherini, Renato Rivolta, Antonio Ballista, Carlo Boccadoro. Gaston Polle Ansaldi made recordings for Phoenix Classics, La Bottega Discantica and Radio 3.

Currently, he's studying Composition in "G. Verdi" Conservatorio in Milano with Giorgio Tedde.