Zagkalis Theologos is a General Practitioner providing online medical services. He is a graduate of the Medical School of Varna Medical University and holds a postgraduate specialization degree in Public Health from the National School of Public Health. He served as a salaried resident physician during his ten-month training for obtaining the General Medicine specialty at the Nea Makri Health Center and later at the General Hospital of Athens "Korgialenio - Benakeio" - Hellenic Red Cross. He has held the position of Assistant General Practitioner, grade B Registrar, at the Primary Health Care Center - Lavrio Health Center, and Assistant General Practitioner with the rank of NHS Physician, Registrar B, at the Primary Health Care Center - Nea Makri Health Center. Finally, from 2022 to 2025, he collaborated with Affidea in the 24-hour DrOnline program, a telemedicine platform offering consultations via text messages and video calls, and was responsible for conducting pre-insurance medical examinations for applicants on behalf of Ethniki Insurance.