Prof.Dr.Hasan Özen graduated from Hacettepe University Medical School in 1982.
He completed his pediatric residency at Hacettepe University Hospital and served as chief resident for one year at the same hospital.
After becoming a pediatrician he specialized in pediatric gastroenterology, hepatology and nutrition, 1991-94, at Hacettepe University Hospital-Ankara. During this period, he studied one year in New York. He has been working at Department of Pediatric Gastroenterology, Hepatology and Nutrition, Hacettepe University School of Medicine, Ankara, since 1991. Dr.Hasan Özen is professor of pediatrics since 2003.
He has served as the president of Turkish Society for Pediatric Gastroenterology, Hepatology and Nutrition (TURKSPGHAN) from 2006 to 2010, and, on behalf of TURKSPGHAN, organized 43rd ESPGHAN Annual Meeting in Istanbul. He is currently the vice president of TURKSPHAN. He organized many educational meetings for residents, pediatricians and pediatric gastroenterologists.
He is author/co-author of more than 100 peer-reviewed publications. His main interest is clinical nutrition.