Dr. Stan Marks graduated from the University of Pretoria in South Africa and completed his internship in diseases and surgery of small animals at the University of Missouri (Columbia).He was a resident in a program of small animal internal medicine at the University of Florida and in the field of oncology at the University of California (Davis). Dr. Marks received his doctorate in nutrition at the University of California, where he is currently a professor at the Department of Medicine and Epidemiology.He is a certified member of the American College of Veterinary Internal Medicine (ACVIM) in the specialties of internal medicine and oncology, as well as a certified member of the American College of Veterinary Nutrition (ACVN).He is the Director of Companion Animal Gastrointestinal Laboratory, whose research focuses on expanding knowledge of the background of bacterial diarrhea with special emphasis on infections caused by Clostridium sp.In addition, interests of dr Marx include diagnostic and therapy with dysphagia in dogs. Dr. Marks was honored by many teaching awards and was elected Lecturer of the Year NAVC Conference in 2003.He has published numerous papers in the field of gastroenterology of dogs and cats, and is the author of chapters in many textbooks.