published books of poetry that was directed by him were named in order as mamotretos, which in Spanish loosely refers to a bulky jumbled collection of writings that could be loosely interpreted as a tome. The name was both an example of de Greiff's masterful use of language and his humbleness towards his work and himself. His eighth and last mamotreto would be Nova et Vetera, published a year before his death, and was a collection of new and old found poems of his from even before Panida. Music and Poetry Although de Greiff studied poetry, he had also been influenced by music as a child, and musical qualities guided both his poetry and his prose. Even though he did not follow the same musical path as his brother Otto, his knowledge and love of music drove him to seek and become Professor of Music History at the Conservatory of the National University of Colombia on September 1, 1946. The relationship of his poetry to music has been noted by Stephen C. Mohler in his doctoral thesis (The Poetic Style of León de Greiff, Ann Arbor, Michigan,1969). De Greiff had previously taught at the University from March 1940 to January 1, 1943 as Professor of Literature and Redaction at the Faculty of Engineering Civil servant In 1916 de Greiff received his first job as a civil servant, working as an accountant for the Bank of the Republic until 1925. He later worked as a statistician from February 16, 1926 as Manager of Bolombolo-La Pintada Railway Construction Project until June 11, 1927, when he becomes Chief Statistician for the Departmental Directorate of Roads of Antioquia until June 13, 1931, when he moved to Bogotá and becomes Chief Statistician for National Railways on June 15 until January 27, 1945. From July 1, 1945 to February 28, 1950 he works for the Ministry of National Education working in different posts from Deputy Director of Secondary Education, and Chief of Scholarships, and Director of Cultural Promotion and Fine Arts. As part of an official commission of the Ministry, de Greiff travelled to Mexico City to repatriate the ashes of the poet Porfirio Barba-Jacob; he would again travel outside the country in 1947, when he travels to Lima, Peru as Delegate of the Ministry of National Education to the II Bolivarian Games. In his role as Director of Cultural Promotion and Fine Arts he co-founds