Dr. Jonathan O'Brien is passionate about perinatal care, having completed his residency in obstetrics and gynecology at Saint Barnabas Medical Center in Livingston, NJ. His research interests include prenatal diagnosis and preeclampsia, and he provides high-risk pregnancy services and care, including prenatal diagnosis, preconception counseling, and care for pregnancy-related complications and medical complications of pregnancy at New Jersey Perinatal Associates in Warren, NJ.