Prof. Dr. Rainer Wirth has held the chair for geriatrics at the Ruhr University Bochum since 2016 and is director of the clinic for geriatric medicine and early rehabilitation at the Marien Hospital Herne, University Hospital of the Ruhr University Bochum. He studied human medicine at the Heinrich Heine University in Düsseldorf. From 2001 to 2016, he worked as chief physician at the Marien Hospital Borken. Since 2004, Professor Wirth has been the spokesperson for the DGG's Nutrition and Metabolism Working Group. As part of his habilitation at the Chair of Geriatrics at the Friedrich Alexander University Erlangen-Nuremberg in 2012, he dealt with issues related to nutritional disorders in old age. In addition to body composition, sarcopenia, and micronutrient deficiencies, swallowing disorders are also part of his field of expertise. In the field of clinical nutrition, he has been involved in the creation of three international evidence-based guidelines. He is a certified instructor for the flexible endoscopic evaluation of swallowing (FEES) according to the German and European curricula.