Leonidas started his career in the Music Industry as an artist signed for two labels and releasing several records with his Band Alliance and as a solo artist. Shortly after he became a professional songwriter and producer with a string of Gold and Platinum releases around the world. He continued his career as a manager and Independent Publisher until he joined Imagem Music in 2014 as their senior A&R Germany and Senior International A&R responsible for the worldwide roster. Imagem was back then the biggest Indie Publisher in the world and the home of Daft Punk, Mark Ronson, Phil Collins etc. In 2018 he joined Universal Music as their senior A&R Manager for the labels Polydor and Island.