Member of the Department of Gastroenterology. Chief of the Department of Health Sciences, Faculty of Medicine,  Pontificia Universidad Católica de Chile. Dr. Riquelme is a clinical researcher and his areas of expertise include H. pylori infection and the relation between this bacteria and development of gastric premalignant lesions and gastric cancer. He is former President of the Chilean Society of Gastroenterology and President of the Panamerican Gastroenterology Organization (2021-2023)