Doris Rosenthal, from Rio de Janeiro, Brazil, is Professor at the Federal University of Rio de Janeiro, Brazil, and head of the Laboratory of Endocrine at the Instituto de Biofísica Carlos Chagas Filho. Dr Rosenthal graduated in Medicine in 1957 at the University of Rio de Janeiro, Brazil. In the sixties Dr. Rosenthal was one of the pioneers in the usage of radioisotopes in Medicine and Endocrinology at Rio de Janeiro. She obtained her M.D.Sc. degree in 1975 at Federal University of Rio de Janeiro, studying thyroid hormone kinetic parameters in =B3hot=B2 thyroid nodules. She did her post-doctoral training at the Unit de Recherches sur la Glande Thyroide et la Regulation Hormonale under Mira Pavlovic-Hournac (1978). As a Professor at the Federal University and of the of the Post-Graduate Program in Endocrinology at the Pontifícia University of Rio de Janeiro, Dr Rosenthal has been very active as advisor of many under-graduate and post-graduate students, and has worked to improve the understanding of thyroid gland function and regulation, and introduced new techniques for their study in Brazil. The majority of her students are now Professors in the areas of Physiology and Endocrinology. Dr Rosenthal is the author of more than 60 original papers and book-chapters and the advisor of 28 thesis (22 M.Sc. and 6 Ph.D.) in the areas of peripheral metabolism of thyroid hormones, methods of hormone measurements, thyroid hormone biosynthesis, genesis of goiter, and others. Dr Rosenthal has served in several committees in the University, the Brazilian Societies of Endocrinology and Metabolism, of Physiology, of Biophysics, the Latin American Thyroid Society, Brazilian Research Council, Rio de Janeiro State Research Council, Rio Grande do Sul State Research Council and Pernambuco State Research Council.