Maternal-Fetal Medicine Fellows

Nkechinyelum Ogu, MD

Third Year

Dr. Kiki Ogu completed her residency training at Northwestern University Feinberg School of Medicine in June 2023 and stayed to complete her Maternal Fetal Medicine fellowship training. She has an interest in fetal surgery and plans to complete a second fellowship in fetal surgery after completion of her training gin maternal-fetal medicine. Her interests include placenta accreta spectrum disorders, global medicine, and health disparities. Her collegiate background in poverty, justice and human capabilities served as the impetus for her focus on health equity as a maternal-fetal medicine physician. She completed formal education in global health and health disparities in both medical school and residency training via certificates of education. Her thesis is yet to be determined. Her current research efforts focus on quality improvement regarding trichomonas screening in pregnancy, obesity during pregnancy, impact of aspirin of fetal ductal flow on fetal echocardiography, and maternal mental health for patients undergoing fetal surgery. She will graduate fellowship in 2026.

Eleanor R. Germano, MD

Second Year

Her current research focuses on vaccination in pregnancy. She is also leading two interdisciplinary  cardio-obstetric initiatives in partnership with our cardiology colleagues: 1) development of a maternal cardio-obstetrics database to support research aimed at improving maternal care for patients with cardiac disease, and 2) quality improvement initiatives to improve clinical care pathways, the patient-provider experience, and Cardiac Care plan development that enhances communication and shared decision-making with patients. She is expected to graduate fellowship in 2027.

Colleen Judge-Golden, MD

First Year

Dr. Judge-Golden is a first year Maternal-Fetal Medicine fellow at Feinberg. She received her medical and PhD degrees from the University of Pittsburgh School of Medicine and completed her residency training at Duke University Medical Center in Durham, North Carolina. Her interests include the complex intersections between Maternal-Fetal Medicine and abortion care, including periviability and termination for medical indications, as well as postpartum and inter-pregnancy care gaps and inequities. Current projects include a cost analysis evaluating universal syphilis re-testing at delivery admission in Illinois, a cohort study investigating the relationship between diabetes control between pregnancies and adverse pregnancy outcomes, and evaluation of subsequent pregnancy outcomes after pathologic diagnosis of massive perivillous fibrin deposition in the placenta. She aspires to a joint career in high-risk obstetrics and research focused on improving quality and equity in reproductive health care. She is expected to graduate fellowship in 2028.

Sarah E. Martinez, MD

Incoming (July 2026)

Mariana Espinal, MD

Dr. Mariana Espinal joined Northwestern in July 2022 after completing her residency at Yale-New Haven Hospital. Her research interests include labor management, preterm labor, premature prelabor rupture of membranes, postpartum pain control, and infectious disease in pregnancy. Dr. Espinal is also passionate about surgical teaching and obstetrical procedures including amniocentesis, cerclages, and complex surgery for placenta accreta spectrum. Her ongoing projects include evaluation of disparities in postpartum pain control, evaluation of gestational latency after preterm prelabor rupture of membranes and use of tocolysis, and updates in management of human immunodeficiency virus in pregnancy. She completed her fellowship in June of 2025.

Dr. Espinal is currently an Assistant Professor of Obstetrics, Gynecology & Reproductive Sciences at the Yale School of Medicine.

Nigel Madden, MD

Instructor - Beth Israel Deaconess Medical Center
2024

Nigel Madden, MD joined Northwestern in July 2021 after completing her residency at Columbia University Irving Medical Center. Dr. Madden’s interests are in advocacy, healthcare disparities in obstetrics, management of periviable complications, and quality improvement. At the 2024 Society for Maternal Fetal Medicine annual conference, she participated in the Comprehensive Reproductive Health scientific forum during which she presented her work evaluating the association between abortion restriction severity and access to maternal and family social services. In March 2024, she presented her research on area poverty and pre-gestational medical comorbidities at the Society for Reproductive Investigation annual meeting. Her projects included an evaluation of perinatal outcomes in unintended pregnancies, the association between patient-reported social determinants of health and birth outcomes, and disparities in primary cesarean section rates and indications within our hospital. She also worked closely with the Birth Equity team at Northwestern to improve processes of care for disadvantaged individuals and completed the Academy for Quality and Safety Improvement (AQSI) program at Northwestern. Additionally, she was involved in the initiation of and served as a frontline provider for the Perinatal Syphilis Warmline which is an IL-based consultative service, provided in conjunction with the IDPH, designed to help target rising rates of perinatally-acquired syphilis. She graduated from fellowship in June and started her faculty career as an Instructor at Beth Israel Deaconess Medical Center in September 2024.

Stephanie A Fisher

Assistant Professor - Northwestern University Feinberg School of Medicine
2023

 Faculty Profile

Dr. Fisher joined Northwestern University Feinberg School of Medicine in July 2020 after finishing her residency at the Barnes-Jewish Hospital/Washington University in St. Louis. She had previously completed her Master of Public Health at the University of Miami Miller School of Medicine. She has a special interest in HIV and other infectious diseases in pregnancy, preterm birth, fetal growth restriction, and management of abnormal labor. For her thesis she has completed a cost-effectiveness analysis of universal first trimester serologic CMV screening and valaciclovir prophylaxis. She completed her fellowship training in June 2023 and joined the MFM Faculty at Northwestern University Feinberg School of Medicine.

Irina Rozin Cassimatis, MD

Assistant Professor - Oregon Health Sciences University
2022

Saba H. Berhie, MD

Instructor - Brigham and Women's Hospital
2021

Ashish Premkumar, MD, PhD

Assistant Professor - University of Chicago Medicine
2020

Ashish Premkumar, M.D., started his training in July 2017 after completing a residency in Obstetrics and Gynecology at University of California, San Francisco. His particular interest is in perinatal substance abuse, preeclampsia, and bioethical concerns in perinatal health. Dr. Premkumar also completed graduate training in cultural anthropology at The Graduate School at Northwestern University, with a focus on the intersection of perinatal substance abuse and socioeconomic marginalization. Currently, an Assistant Professor in the Section of Maternal-Fetal Medicine in the Department of Obstetrics and Gynecology at Pritzker School of Medicine, The University of Chicago.  His clinical and research interests include the intersection of maternal-fetal medicine and family planning, maternal-fetal therapy, perinatal infectious diseases, hypertension in pregnancy, and placenta accreta spectrum disorder.

Nevert Badreldin, MD, MS

Assistant Professor - Baylor College of Medicine
2019

Dr. Badreldin joined Northwestern University Feinberg School of Medicine in July of 2016 after she completed her residency at Duke University in Durham, North Carolina. Her special interests are in clinical obstetrics and preterm labor, and her research and thesis during fellowship was focused on Postpartum opiod prescribing practices and patient utilization.  Upon completing her fellowship in July of 2019, she joined Northwestern as a faculty physician until early 2024. She is currently an Assistant Professor on the Maternal-Fetal Medicine faculty at Baylor's College of Medicine and Texas Children's in Houston, TX. 

Ann Melissa Dude, MD, Ph.D

Assistant Professor - UNC School of Medicine
2018

Dr. Dude joined Northwestern University Feinberg School of Medicine in July 2015 after completing her residency at University of Illinois at Chicago, Chicago, IL.  Her special interest are clinical obstetrics and preterm labor.  Her thesis and research interest during fellowship focused on the Inter-delivery weight gain and risk of cesarean delivery following prior vaginal birth.  Dr. Dude completed her fellowship in 2018 and has joined the MFM faculty as an Assistant Professor at the University Of North Carolina, Dept of Obstetrics and Gynecology in Chapel Hill, NC.