Gravvanis Xristos MD, PhD (c) is a Military Physician, Endocrinologist - Diabetologist, and maintains his private practice in Helliniko, while simultaneously serving as an attending physician in the Endocrinology Clinic of the 251 Air Force General Hospital. He is a doctoral candidate at the Medical School of the National and Kapodistrian University of Athens and holds a medical degree from the Medical School of Aristotle University of Thessaloniki and the Military Officers School of Corps (SSAS). He specialized in Endocrinology at the Endocrinology Unit and Metabolism and Diabetes Center of GNA G. Gennimatas, the 1st Internal Medicine Clinic of the 251 Air Force General Hospital, and during his specialty training, he received education at the Menopause and Climacteric Department of the 2nd Obstetrics and Gynecology Clinic of the University of Athens, in Endocrine Disorders during Pregnancy at the Endocrinology Department of GNA Elena Venizelou, and in Pediatric Endocrinology at the Endocrinology Department of Growth and Development, G.N.P.A. P&A Kyriakou. Additionally, he attended and successfully completed numerous seminars (Advanced Trauma Life Support (ATLS), Prehospital Trauma Life Support (PHTLS), Advanced Life Support (ALS), Air Force Medicine School). He is a member of the Athens Medical Association and the European Society of Endocrinology (ESE), as well as the Medical Association of the Oberbayern region in Germany (Deutsche Approbation als Arzt/ Regierung von Oberbayern). Finally, he possesses extensive research activity with published papers in international medical journals and numerous presentations at Greek and international conferences. In his practice, he manages cases covering the entire spectrum of his specialty, providing personalized care to each patient with the goal of delivering high-quality services in a modern endocrinology clinic.