Dr. Daniel Pedro Cardinali completed his MD and PhD degrees at the University del Salvador, Buenos Aires. During 1971 and 1972 he was Research Assistant at the Department of Nutrition and Food Science, MIT, USA. Since 1973 he has been a Research Career Awardee of the Argentine National Research Council, being promoted to its highest stage (Superior Investigator) in 1992. From 1986 to 2008 he was Professor of Physiology at the Faculty of Medicine, University of Buenos Aires, being nominated as Professor Emeritus in 2010. Since 2009 he has been Director of Teaching & Research at the Faculty of Medical Sciences, Pontificia Universidad Católica Argentina, Buenos Aires. Dr. Cardinali’s fields of interest include the Physiology and Pharmacology of Melatonin and Biologic Rhythms, and their relationships with Sleep Medicine. The most relevant awards and honors he has received include the John Simon Guggenheim Fellowship, New York (1977), the Curt P. Richter Prize, International Society of Psychoneuroendocrinology (1983), honorary doctorates in Medicine from Complutense University, Madrid, Spain (1991) and the University of Salamanca, Spain (1998), and membership in the Royal Academy of Medicine, Spain (1991). In 2007 he was awarded the Scopus Prize, Elsevier, Amsterdam, for being the most-cited Argentine scientist in biomedicine, and the Argentine Government’s Bernardo Houssay Award. In 2008 he received the Aaron B. Lerner Pioneer Award in Recognition of Outstanding Contributions to the Field of Melatonin Research, Federation of American Societies for Experimental Biology (FASEB).