Dr. Valdés is mainly interested in the taxonomy, systematics, and biogeography of opisthobranch mollusks. He has published more than 50 scientific articles related to these subjects and has described around 70 new species, including 5 new genera and one new family. He has done fieldwork in numerous localities in the Indo- Pacific and Atlantic including Costa Rica, Mexico, Cuba, Egypt, New Caledonia, and the Philippines. He obtained his doctorate from the University of Oviedo, Spain and completed his post-doctorate at the California Academy of Sciences, USA. Additionally, he has worked as a collaborating scientist at the Museum of Natural History of Paris.