Nikolaos Zacharias, MD, FACOG

Dr. Nikolaos Zacharias, MD, FACOG, is doubly board-certified in Obstetrics & Gynecology and Maternal-Fetal Medicine; he is Clinical Professor of Obstetrics and Maternal-Fetal Medicine at the University of Houston Tilman J. Fertitta Family College of Medicine and at the Texas AA&M University Vashisht School of Medicine. He is recognized for his expertise in high-risk pregnancy management, prenatal diagnosis, and perinatal complication prevention, combining clinical excellence with a strong commitment to patient safety and advancing maternal and fetal health. He serves as Director of Maternal-Fetal Medicine at Saint Joseph Medical Center (HSA/Steward Health) in Houston, Texas, and practices through Pediatrix Medical Group, a division of Mednax, Inc. Dr. Zacharias provides care across multiple hospital affiliations, including the Houston Methodist Health System, St. Joseph Medical Center, and the Woman’s Hospital of Texas. In addition to delivering expert clinical care, he leads medical student education and OB/GYN resident training and perinatal education programs through Obstetrix Medical Group of Houston, ensuring the development of the next generation of healthcare professionals. Dr. Zacharias earned his Doctor of Medicine (MD) from the National and Kapodistrian University of Athens (NKUA), Greece and completed an OB/GYN residency in Women’s Health at Baylor College of Medicine, Houston, TX. He subsequently completed a Maternal-Fetal Medicine fellowship in Perinatology at The University of Texas Medical Branch (UTMB) at Galveston, TX, and pursued a Masters in Medical Science (MMSc) in Medical Research Design at UTMB, completing all coursework with distinction. Fluent in Greek, Spanish and French, he has contributed to the field through publications such as Perinatal Mortality in UpToDate, and remains dedicated to advancing prenatal sonography, maternal-fetal research, and excellence in patient care across hospital and academic settings.

• National and Kapodistrian University of Athens, School of Medicine

• Biomedical Investigators
• GCP for Clinical Trials with Investigational Drugs and Medical Devices (U.S. FDA Focus)
• Pediatrix Clinical Research Policies (To be completed by Pediatrix employees only)
• Board Certified Subspecialist in Maternal-Fetal Medicine
• Board certified maternal-fetal medicine expert
• Board Certified Obstetrician Gynecologist

• American College of Obstetricians and Gynecologists
• Texas Medical Association
• Society for Maternal-Fetal Medicine
• American Institute of Ultrasound in Medicine
• International Society of Ultrasound in Obstetrics and Gynecology

Dr. Zacharias has authored the perinatal mortality chapter on UpToDate.

For a list of his publications, please see his Doximity profile: Dr. Nikolaos Zacharias, MD – Houston, TX | Obstetrics & Gynecology

https://www.doximity.com/pub/nikolaos-zacharias-md