He was born in Valladolid in 1947. Degree in Biology in 1969. Writer of the Encyclopedia Salvat de la Fauna, headed by Félix Rodríguez de la Fuente, from 1969 to 1972. Doctor in Biological Sciences in 1977 at the Complutense University of Madrid, with a thesis on the ecology of the Iberian lynx. Research Professor of the National Council for Research (CSIC) since 1987. From 1988-1996 he was Director of the Biological Station of Doñana. Author of more than two hundred scientific papers in international journals, as well as numerous articles and popular books, including “La naturaleza en peligro” and “LaTierra herida”. Founder and current President of the Spanish Society for the Conservation and Study of Mammals (SECEM). He has received numerous awards, including the National Award “Félix Rodríguez de la Fuente for the Conservation of Nature” (2001) and the National Research Award “Alejandro Malaspina” (2005). Doctor Honoris Causa of the University of Malaga and member of the Royal Academy of Exact, Physical and Natural Sciences.