Armendáriz began teaching at the University of Costa Rica's School of General Studies from 1968, where he held classes in Appraisal of Literature. He became a vital link between the former Faculty of Arts and Sciences and the Theater of General Studies, organizing cultural activities. He also taught at the School of Dramatic Arts. He was also editor of Palabra magazine, Department of General Studies, of the University of Costa Rica (1968 – 1974).
