Nikolaos Zacharias

Nikolaos Zacharias, MD


  • Medical Training

    Nat'l Univ. of Athens Med Sch- European Union
  • Residency

    Nat'l Univ. of Athens Med Sch- European Union, Obstetrics & Gynecology


  • The University of Texas Medical Branch- Maternal & Fetal Medicine

Board Certifications

  • Obstetrics & Gynecology
Nikolaos Zacharias, MD, FACOG, is a native of Greece; he earned his medical diploma with excellence from the National & Kapodistrian University of Athens, Greece (1995) reciting the Hippocratic Oath as a top graduate in his class. Dr. Zacharias received numerous Hellenic scholarships for undergraduate and postgraduate education (1989-2002). He trained in Obstetrics & Gynecology at Baylor College of Medicine (BCM), (1998-2002), elected chief resident by his faculty and peers in 2001. He received the CREOG (Council for Residency Education in Obstetrics and Gynecology) Academic Achievement Award four consecutive years (1999-2002) for scoring at the top 3% of his U.S. peers. Dr. Zacharias’ passion for prenatal sonography and profound interest in pregnancy complications led him to a fellowship in Maternal-Fetal Medicine (MFM) at the University of Texas Medical Branch (UTMB), in Galveston, Texas (2002-2005), where he received the UTMB Hospital Academic Fellowship Award. He was recruited to BCM as assistant professor of OB/GYN-MFM (2005-2013). He served as medical director of the Harris Health System (HHS) Prenatal Ultrasound Screening Program (2005-2012) and as founding medical director of the Ben Taub Maternal Fetal Medicine Prenatal Ultrasound Unit (2008-2012). Dr. Zacharias was a founding member of the Texas Children’s Fetal Center 2006-2013, an attending physician and teaching faculty at Ben Taub General (2005-2013) and Texas Children’s Hospital (2008-2013). He is board-certified in OB/GYN (2008) and MFM (2011). Dr. Zacharias received BCM’s student faculty teaching award (2011) and was elected to America's Top Obstetricians & Gynecologists (2012). He is a fellow of ACOG (2010) and regular member of SMFM (2012). He served as the maternal-fetal medicine director at the Center for Medical Genetics (2013-2014), specializing in early prenatal diagnosis and genetic counseling. Dr. Zacharias was then recruited to the University of Texas and served as the medical director of the prenatal diagnosis/testing center and assistant professor of OB/GYN-MFM at the Lyndon Baines Johnson General Hospital and McGovern Medical School at UTHEALTH (2014-2019), supervising >60,000 prenatal ultrasounds in Southeast Texas in his career. Dr. Zacharias received the UTHEALTH annual Dean's teaching award (2015-2018) for his excellence in medical student, Ob/Gyn resident and MFM fellow education. He has authored several chapters and published in peer-reviewed journals in perinatology, reporting the first case of lethal congenital Zika virus syndrome in the U.S. (2016). He has a keen interest in placenta accreta spectrum and is a co-author of the paper with the largest dataset on this topic in the literature (2014). He is the author of the “Perinatal Mortality” chapter on UpToDate, the trusted online physician resource. Dr. Zacharias joined MEDNAX - Obstetrix Medical Group of Houston in May 2019 as MFM specialist and is excited to offer his expertise to an even wider swath of the prenatal population of Houston. He speaks English, Greek, French and Spanish.
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