Marco Testori began to study piano at an early age and thereafter the organ and the cello. He graduated at the G. Verdi Conservatory in Milano in organ and organ composition in 1991 and then in cello in 1993. After attending some courses with J. Goritzky, M. Flaksmann and E. Bronzi he delved into the study of early music at “Schola Cantorum Basilensis” with C. Coin.
He began to collaborate with several groups such as: I Barocchisti, Ensemble Baroque de Limoges, Complesso Barocco, Accordone, Orquesta Barroca de Sevilla, Ensemble Dolce e Tempesta, Il Cardellino, Ensemble Musica Alchemica, Orchestra da Camera di Mantova, La Divina Armonia, Il Suonar Parlante, Ensemble 1700, L’Accademia Gioiosa : with these groups he recorded for record labels such as Decca, Opus 111, Naxos, Sony, Amadeus and Fuga Libera.
From 1994 to 2004 he was the first cellist of the ensemble Il Giardino Armonico, with which he took part in the most important international festivals (Musica e Poesia a San Maurizio – Milano; Styriarte Festival – Graz; Pfingsten – Salzburg; Osterklang –Vienna; Schleswig-Holstein Musik Festival; Rheingau Festival; Settimane Musicali Internazionali – Luzern; Festival de Musique – Montreux-Vevey) and he performed at some of the most famous halls in the world (Teatro San Carlo – Naples; Concertgebouw – Amsterdam; Wigmore Hall – London; Musikverein – Vienna; Konzerthaus – Vienna; Théâtre des Champs-Elysées – Paris; Tonhalle – Zurich; Alte Oper – Frankfurt; Staatsoper unter den Linden – Berlin; Auditorio Nacional – Madrid; Auditorium P. Casals – Tokyo; Teatro Colon – Buenos Aires; Carnegie Hall - New York; Sydney Opera House). With Il Giardino Armonico he has recorded for Teldec.
He is first cello of the Atalanta Fugiens Ensemble; with this group he has recorded for Sony.
He recorded concertos for cello and strings by Nicola Fiorenza, together with the Dolce & Tempesta Ensemble.
For Passacaille he has recorded concertos and sonatas by the virtuoso Carlo Graziani and a CD on Mannheim cellists’ sonatas.
His last CDs (Brilliant Classic) together with the fortepianist Costantino Mastroprimiano, includes sonatas by Moscheles, Ries and Hummel and the whole sonatas and variations by L.v.Beethoven.
The female choir Convivia Musica under his direction has won many national competitions.
Some of his compositions and elaborations, purposed written for this choir, have received special recognition in choir competitions.
He gives masterclasses and summer courses on baroque cello and classical chamber music.
Since 2013 he is Professor of baroque cello at Universität Mozarteum Salzburg and, since the 2021-2022 academic year, associate professor at the Reina Sofía School of Music’s Sociét´´e Générale Historical Performance Programme.