Agustín Nieto Caballero (1889–1975) was a Colombian pedagogue who, in 1914, founded Gimnasio Moderno, a prestigious primary and secondary school located in Bogotá. The Modern school is considered to b.. Read more »e the oldest of its kind in a time were education was dominated by the Church-ruled Catholic schools. Mr. Nieto Caballero was the preceptor of illustrious Colombians that studied at Gimnasio Moderno.