Seth M. Rubin, MD, FACOG, is a highly respected, board-certified obstetrician and gynecologist at Advanced Obstetrics & Gynecology, LLC, with offices in Lebanon, Branchburg, and Flemington, New Jersey. Dedicated to providing compassionate, patient-centered care, Dr. Rubin has been serving women and families in the Hunterdon County region since 1993. He is known for his approachable style, commitment to building lasting relationships, and expertise in both routine and complex gynecologic and obstetric care.
Dr. Rubin graduated from the University of Pennsylvania in Philadelphia before earning his medical degree from the Albert Einstein College of Medicine in New York, where he completed an honors research project in obstetrics and gynecology. He went on to complete his residency training at the Hospital of the University of Pennsylvania, where he trained under some of the nation’s leading experts in the field.
Throughout his more than 30 years in practice, Dr. Rubin has earned widespread recognition for his clinical excellence. Since 2008, his peers have consistently honored him as a Top Doctor in New Jersey, reflecting both his advanced skill set and the trust he inspires among colleagues and patients alike.
At Advanced Obstetrics & Gynecology, Dr. Rubin offers a full spectrum of women’s health services, including advanced minimally invasive gynecologic procedures. He provides expert care for conditions such as uterine fibroids, irregular bleeding, infertility, menopause, and hormonal disorders, in addition to supporting patients with birth control management, pregnancy care, and other reproductive health needs. His goal is to empower women with knowledge, options, and high-quality care at every stage of life.
Outside of his medical practice, Dr. Rubin values time with his wife and two daughters. Together, they enjoy outdoor activities such as hiking and canoeing, as well as cultural experiences like theater and concerts.
Your health matters. Your voice matters. And your story matters.
At Advanced Obstetrics & Gynecology, we’re here to support you every step of the way — with compassion, expertise, and care that feels personal. Whether you’re scheduling your first visit or returning for ongoing care, we’re honored to be your partners in health.
Call us today or request an appointment online. We can’t wait to meet you.
Real words from real women — honest stories of care, comfort, and confidence. We’re proud to be part of their journey.

★★★★★
"I had a wonderful experience with this practice. I moved and had to switch practices at 30 weeks pregnant and they were so on top of scheduling, took the time to understand my medical history, and treated my high risk pregnancy seriously despite my late ...

★★★★★
"I have nothing but wonderful things to say about this office. The receptionists are so kind, extremely helpful. I love my Dr, I feel as though she really listens to what I have to say and has helped me through a tough journey. There have been several instances ...

★★★★★
"Dr Rubin is hands down the best doctor I have ever had. He truly has listened to me, always takes his time to address all questions and concerns. Never makes you feel silly for asking any question and he makes sure you feel heard....

★★★★★
"I cannot say enough good things about this practice; especially about Dr. Abeysinghe. She is amazing. I work in healthcare. It is not easy to impress me. I would never know this was a large practice. The office staff calls with results, returns calls, always ...