Dr. med. E.X. Keller is a Consultant Urologist at the University Hospital Zurich in Switzerland. He has become a Fellow of the European Board in Urology in 2018 and has been trained by Prof. Dr. Olivier Traxer during a one-year fellowship in Paris. Dr. Keller has been awarded a diploma from the Endourological Society, best doctoral thesis at the University of Zurich in 2016 and a AUA18 Best Poster Price in 2018. His main fields of specialty are metabolic and surgical management of Urinary Stone Disease, as well as medical and surgical management of BPH (including Laser-Enucleation and Vaporization). Dr. Keller has pursed research activities in Endourology with multiple collaborative international projects up to date.