Born in Athens, Petrou studied piano at the Conservatory of Athens, then at the Royal Academy in London, with the support of the Onassis Foundation. As a pianist he performed in a duo with the pianist Christos Papageorgiu, winning the Redding-Piette competition in 1995. His recordings of Handel have tended to final versions, unknown works such as pasticcios. His recordings of Greek composers include the Don Crepuscolo of Nikolaos Mantzaros, performed by bass Christophoros Stamboglis (MDG, LC06768, 2011)
He will become artistic director of the Göttingen International Handel Festival at the beginning of the 2021/22 season. He was previously artistic director of Armonia Atena. He was appointed member of the Royal Academy of Music in London and received the title of ‘Chevalier de l’ordre des Arts et des Lettres’ by the French government.