Sergio came to the University of Puerto Rico from his undergraduate studies in the Universidad de Antioquia, Medellín, Colombia. Sergio was planning to do a phylogeographic and conservation genetic analysis of the Black-Thighed Puffleg Eriocnemis derbyi, a hummingbird inhabiting the páramo biotope of Colombia and Ecuador. Unfortunately, Sergio never fulfilled his dream. While hiking in the El Yunque national forest in Puerto Rico on Memorial Day Monday in 2009, Sergio, together with Fernanda Okamura Abensur of Manaus, Brazil, lost his life in a flash flood. We miss you both!