Tzellas Sotirios is an Otolaryngologist who maintains a private practice in Karditsa. He is a graduate of the Medical School of Aristotle University of Thessaloniki. He received specialized training in Endoscopic - Surgical Treatment of the Nose and Paranasal Sinuses at the University Hospital Center of Zagreb, Croatia, where he participated in over 150 endoscopic rhinological surgeries (FESS) and performed over 50 as the lead surgeon. As a private practitioner, he collaborates with Iaso Thessaly, where over the past 6 years he has performed more than 200 surgical procedures covering the full range of Otolaryngology surgeries in both adults and children. He worked at the Otolaryngology Clinic of the General Hospital of Thessaloniki "Hippocrates," where he managed patients with acute otolaryngologic conditions such as epistaxis, upper respiratory infections, cervical abscesses, laryngeal edema, head and neck trauma, acute hearing loss, oncologic patients, and others, as well as postoperative care. Finally, the physician has many years of experience and specialization in pediatric otolaryngology, rhinology - FESS, removal of facial skin lesions, and reconstructive plastic surgery.