Joel Faintuch MD is a gastrointestinal surgeon, and former International Guest Fellow of the American College of Surgeons. He is Honorary Fellow of three foreign Surgical Societies and has served as Visiting Professor at the University of Maastricht. During his career, he has been interested in a variety of subjects, including nutrition, metabolism, obesity, and ethics in research. He was the introducer of Parenteral and Enteral Nutrition in Brazil and South America and a founding member of different medical societies. In the last 20 years, he has acted as vice-president of the Ethics in Research Committee, Hospital das Clinicas and Sao Paulo University Medical School, which is the oldest and largest in Latin America. Dr. Faintuch is the author of over 270 articles in peer-reviewed journals, along with 12 books, three theses, over 200 chapters in books, and other publications.Salomao Faintuch MD is a radiologist and Clinical Director of Vascular and Interventional Radiology at Beth Israel Deaconess Medical Center, Harvard Medical School. He has authored more than 50 articles in peer-reviewed journals, along with 8 Society Guidelines and Standards of Practice. He is a Radiological Society of North America Research Scholar, has participated in eight National Society Committees and is a member of the Editorial Board of three international journals.