William L. Hasler, MD is a Professor of Medicine in the Division of Gastroenterology and Hepatology, at the Mayo Clinic in Scottsdale, Arizona. Dr. Hasler’s research focuses on nausea and vomiting and the pathophysiology of gastric motility disorders, and he is an internationally recognized expert in clinical and translational research in CVS and gastroparesis. He serves as a lead advisor to the Rome Foundation and has helped craft the clinical descriptions of CVS and CHS in adults. He also provided pivotal input to develop the first clinical guidelines on the management of CVS in adults