The Italian conductor and harpsichordist Alessandro de Marchi first studied organ and composition at the Conservatory di Santa Cecilia in Rome, going on to study harpsichord, basso continuo, chamber music and Baroque style at the Schola Cantorum Basiliensis. Whilst there he was inspired to undertake philological research on early musical manuscripts and treatises. He then became Professor of organ and Gregorian chant at the Conservatory D. Cimarosa, pianist of the St. Louis Big Band, and harpsichordist with the Italian Baroque Orchestra, and went on to become conductor of the Chamber Orchestra of G. Carissimi, being awarded his diploma in organ and composition.

Alessandro de Marchi then began his collaboration with the ensemble Il Teatro Armonico with whom he toured Europe as well as making recordings and radio broadcasts of unpublished Italian Baroque works. Alessandro de Marchi has conducted much-applauded productions and since he has been in much demand, conducting in prestigious venues throughout Europe.

He is also a regular guest conductor at the Rossini Festival of Bad Wildbad and the Halle Händel Festival.