Prof. Dr. Coskun Celtik I am MD and academic person in T.C. Health Sciences University Istanbul Ümraniye Training and Research Center. My academic degree is professor. My specialist areas are pediatric gastroenterology, hepatology and nutrition in addition to general pediatrics. Moreover, I interest the respiratory and gastrointestinal allergic diseases in children. Most of my researches include these subjects. Previously, I worked the Departments of Pediatric infection, Respiratory and Allergic Diseases from 2001 to 2005 years in Trakya University. After then, I worked as a fellow in Department of pediatric gastroenterology, hepatology and nutrition in Istanbul School of Medicine between 2005-2008 years, After 2008 year, I worked as a pediatric gastroenterologist in Trakya University, Gaziantep Children Hospital and Sifa University, respectively. Currently, I am working in Department of Pediatric Gastroenterology in T.C. Health Sciences University Istanbul Ümraniye Hospital.