We are very lucky to have two excellent professionals in gastrointestinal endoscopy: Dr. Katsumi Yamamoto is the Director of Endoscopy Center in Japan Community Healthcare Organization Osaka Hospital (Osaka. Japan) and has a special dedication to submucosal endoscopic dissection (ESD). George Mavrogenis is a young endoscopist working at the Gastroenterology Unit in Mediterraneo Hospital (Athens. Greece). He has a special dedication to therapeutic endoscopy, especially ESD, POEM an others. He has a YouTube channel with excellent videos of therapeutic endoscopy.