Professor Emeritus of Pediatrics at Saarland University, Germany, and the past Chairman of the Renal Tumor Study Group of SIOP. He is the Principal Investigator of the UMBRELLA protocol for childhood kidney tumors and an Associated International Member of the Children's Oncology Group (COG). With over 40 years of experience in clinical trials, he focuses on personalized medicine and AI-driven modeling of kidney tumor treatment. Dr. Graf has authored over 500 scientific publications with an h-index of 70.