Texas Christian University Professor Since 2000 Texas Christian University Associate Professor 1994 - 2000 Texas Christian University Assistant Professor 1990 - 1994 University of Hawaii Post - Doctoral Fellow 1988 - 1990 Institute of Experimental Assistant Researcher 1987 - 1988 Biology and Medicine, (Conicet) Argentina. University of Buenos Aires, Assistant Professor 1985 - 1987 Institute for Research o n Fellow (Conicet) 1982 - 1985 Marsupials and Edentates, Argentina. University of Pennsylvania Fellow (Conicet) 1982 University of Minnesota Fellow (Conicet) 1980 - 1982 Department of Biology, Research - Teaching 1976 - 1980 University of Buenos Aires. Assistant