Positions

• -Full Professor – Department of Biology, University of Puerto Rico, Río Piedras campus (September 4, 2001 - present). - Director –Center for Tropical Applied Ecology and Conservation, University of Puerto Rico, Río Piedras campus (September 1st, 2002 – present ). - Associate Investigator II & III (September 1988 – April 1999), Full Associate Investigator (1999-2001) – Plant eco-physiology laboratory, Ecology Center, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela. - Scientific collaborator - USDA Forest Service International Institute of Tropical Forestry, Rio Piedras, PuertoRico (1988 – present) - Visiting Scientist, Plant eco-physiology laboratory, Centro de Ecología, IVIC, Caracas, Venezuela (2004 - 2015) - Adjunct faculty at the Department of Management and Conservation of Natural Tropical Resources, Faculty of Veterinary and Zootechnology, Universidad Autonoma de Yucatán, Mérida, México (May 2004 - June 2010). - Adjunct Professor - Department of Biology, University of Puerto Rico, Río Piedras campus (August 2000 – July 2001) - Visiting Associate Professor - Department of Botany, University of Florida, Gainesville, Florida, USA (December 30 1994 - May 11, 1995). - Visiting Professor – School of Biological Sciences, Stanford University (September 1993 – July 1994). - Scientific Associate III – Terrestrial Ecology division, Center for Energy and Environmental Studies of the University of Puerto Rico (formerly Puerto Rico Nuclear Center, US Atomic Energy Commission) (July 1974 - July 1977), Universidad de Puerto Rico - Rio Piedras