Dr. Hajje has 15 years of experience in the endocrinology field and has worked as a consultant at several hospitals in both Lebanon and France. He specialises in thyroid disorders, including hyperthyroidism, hypothyroidism and thyroid cancer. Dr. Hajje graduated from Saint Joseph University, School of Medicine, Beirut, Lebanon, and completed his residency at the Hotel-Dieu De France Hospital. He then pursued his fellowship in endocrinology at various reputed hospitals in Paris, France including Cochin Hospital, Bicetre Hospital and Institut Gustave Roussy, before returning to Lebanon to begin his career as a consultant endocrinologist there.