John Tellez was born in Bogota, Colombia.
At the age of ten, he took his first piano lessons with his uncle in law the conductor Pedro Enrique Peña Bernal.
At the age of 15 he begun harmony and classical guitar studies with his uncle and he started composing his firts compositions. At the same age he took some lessons with the pianist Cecilia Casas, professor at the Conservatorio de la Universidad Nacional de Colombia and founder of the contemporary music festival of Bogota. One year later he took lessons with the the pianist and organist Juan Carlos López Peña, professor at the Conservatorio del Tolima and the Colombian representative at the WPC (world piano conference) in novi sad (Serbia) in 2018.
In 2012 he began his studies in piano at the Conservatorio de la Universidad nacional de Colombia and in 2015 he began his studies in composition in the same institution. In the conservatory he studies composition with Mauricio Arias, Gustavo Parra, Moisès Bertran i Ventejo y Harold Vásquez Castañeda, piano with Piedad Pérez, organ with Mauricio Nasi and theory with Svetlana Skriagina De Pérez and Alena Krasútskaya.
His music has been performed in Colombia, Netherlands and Germany.