Prof. John N. Boletis graduated from the Athens University Medical School, where he completed his Ph.D thesis. He obtained his Internal Medicine Specialty and his Nephrology specialty at Laiko General Hospital in Athens, where he has ever since been a consultant at the Nephrology Department and Renal Transplantation Unit. For two years, he served in the Nephrology Department of the Royal Hallamshire Hospital, University of Sheffield, in the UK. Through a European Union fellowship, he studied renal osteodystrophy, in collaboration with the Department of Human Metabolism and Clinical Biochemistry of the University. Since 2003, he has been the Director of both Nephrology and Renal Transplantation at Laiko General Hospital and, since 2005, he has served as the Chief Medical officer of the hospital. In 2013, he was named Professor of Nephrology for the University of Athens Medical School. Over the years, he has served as Secretary General, Vice President, and President of the Hellenic Society of Nephrology, the Hellenic Society of Transplantation, and the Hellenic Society of Medical Studies. He has also been a member and currently serves as the Vice President of the Hellenic Transplantation Organization. His research work focuses primarily on renal transplantation and clinical nephrology, with a special interest in immunological diseases of the kidney.