With a medical degree in Japan, upon his PhD in 1992 at Iwate Medical University, Japan, Toshimi Chiba belonged to the First Department of Internal Medicine, Iwate Medical University, Japan. Over the last 20 years, he has focused his scientific interests on the topics related to gastrointestinal (GI) disorders including functional GI disorders (FGIDs), peptic ulcer disease, inflammatory bowel disease (IBD) and GI endoscopy. Especially, he also belonged to the GI Research Unit, Mayo Clinic, Rochester, Minnesota, USA, he studied GI motility such as gastric emptying, GI transit and functions of peptides in the GI tract. He is a member of evidence-based clinical practice guidelines for irritable bowel syndrome, peptic ulcer disease and chronic constipation in the Japanese Society of Gastroenterology (JSGE), and guidelines for endoscope disinfection in the Japan Gastroenterological Endoscopy Society (JGES). He has published numerous SCI journal papers, edited/reviewed for many academic journals, and received awards from JSGE (1992) and AGA (1999).