Maternal Fetal Medicine of Southwest Florida





William F. O’Brien, M.D.

Dr. O’Brien completed his residency in Obstetrics and Gynecology at Yale after graduation from New York University. A fellowship in Maternal-Fetal Medicine and tenure in the Navy was followed by over twenty years in academic medicine. He is board certified in Obstetrics and Gynecology, and Maternal-Fetal Medicine and has served as an examiner for the American Board of Obstetrics and Gynecology. He has published over one hundred and fifty scientific articles and has received numerous awards. He has special interests in invasive prenatal diagnosis and multiple marker screening.

Mark C. Williams, M.D.

Dr. Williams graduated from the University of Minnesota School of Medicine and completed residencies in Family Practice Obstetrics and Gynecology before studying Maternal-Fetal Medicine at the University of South Florida. He is board certified in Family Practice, Obstetrics and Gynecology, and Maternal-Fetal Medicine. Dr. Williams has published over fifty scientific articles and has a special interest in prenatal sonographic diagnosis and fetal growth pattern analysis.



Judith Krammer, M.D.

After graduation from Queens College in New York City, Dr Krammer attended medical school at Semmelweisz University School of Medicine, Budapest, Hungary. She completed a residency in both Internal Medicine and Obstetrics and Gynecology before training in high risk obstetrics and fetal medicine. Dr. Krammer is board certified in Internal Medicine, Obstetrics and Gynecology, and Maternal-Fetal Medicine. She has given numerous lectures and written over fifteen scientific articles. Dr Krammer’s special interests include medical problems in pregnancy and management of the fetus with birth defects.

Lorain K. Endres, M.D.

Dr. Endres graduated from the Ohio State University College of Medicine and completed residency at the University of Pennsylvania. She practiced academic medicine in Chicago after finishing fellowship at Northwestern University until moving to southwest Florida. She is board certified in Obstetrics and Gynecology and Maternal Fetal Medicine and has over 17 publications. Dr. Endres' special interests include multifetal pregnancies and prenatal diagnosis.




Renee M. Peet
CNM, ARNP, MSN


Renee Peet is a native Floridian and moved to Southwest Florida in 1994. She graduated from Florida State University College of Nursing in 1985 and worked as a Registered Nurse for many years in several areas of nursing including work in labor and delivery at Broward General Medical Center in Fort Lauderdale. Renee then went on to obtain her Master's Degree as an Advanced Registered Nurse-Practitioner, with a specialty in Nurse-Midwifery from the University of Miami in 1994. As a nurse-midwife Renee has worked both clinically and administratively to ensure the health of women during and outside of their pregnancies, (including caring for many high-risk pregnant women at Lee Memorial Health System, as part of the Southwest Florida's high-risk pregnancy program). Renee's special interest is helping pregnant women and their families navigate the stressful time of coping with their high-risk diagnosis during the course of their pregnancy, and to obtain the healthiest outcome for them and their newborn.


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