Leo Leandros (born 23 August 1926) is a Greek musician, composer and producer. Born in Astakos, Greece, Leandros left in the 1950s for Germany to pursue a career in singing and composing. He had some success, but shifted his focus to his daughter, Vicky, who had been singing from a very early age. He became her manager, composer and producer when she was 13, and is responsible for her unique training and career. Under his pseudonym Mario Panas he was the co-composer (together with ) of Après toi, the winning title of the 1972 Eurovision Song Contest, which Vicky performed for Luxembourg.