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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.

Yelena Belkina, MD, is a skilled and caring obstetrician and gynecologist dedicated to supporting women’s health at every stage of life. She sees patients at Advanced Obstetrics & Gynecology, LLC, with offices in Lebanon, Branchburg, and two locations in Flemington, New Jersey. Dr. Belkina has special expertise in preventive care, adolescent care, contraception, minimally invasive surgery, and managing abnormal bleeding.

Dr. Belkina attended the Sophie Davis School of Biomedical Education at the City University of New York before earning her medical degree from the State University of New York Downstate College of Medicine. She then completed her residency in obstetrics and gynecology at Rutgers Robert Wood Johnson Medical School in New Brunswick, New Jersey.

Throughout her training and career, Dr. Belkina has been recognized for her excellence in both education and research. She served as chief resident in obstetrics and gynecology and received the Excellence in Research Award from the Council on Resident Education in Obstetrics and Gynecology (CREOG). She is fluent in Russian, proficient in English, and can communicate in Spanish in a conversational medical setting.

Outside the office, Dr. Belkina enjoys traveling, exploring new places, and spending quality time with her husband and their three children. She was named to Castle Connolly’s Jersey Best Rising Stars Top Doctors list in 2022.

Denise M. Pisatowski, MD, is a board-certified OB/GYN at Advanced Obstetrics & Gynecology, LLC in Flemington and Lebanon, New Jersey. With over 20 years of experience, Dr. Pisatowski is genuinely passionate about her patients.

Dr. Pisatowski graduated from Cornell University in Ithaca, New York, with a bachelor’s in biology. She later completed her medical school training at Rutgers Medical School in Newark, New Jersey, and finished her OB/GYN residency training at Saint Peter’s Hospital in New Brunswick.

A fellow of the American Congress of Obstetricians and Gynecologists, a diplomate of the National Board of Medical Examiners, and board-certified by the American Board of Obstetrics and Gynecology, Dr. Pisatowski’s reputation precedes her. She practices throughout the full gynecologic spectrum, including special interests in vulvar disease, contraception, PCOS, abnormal uterine bleeding, menopause, and hysteroscopy.

Dr. Pisatowski has been named by Castle Connolly in 2025 as Exceptional Women in Medicine, a recognition of top female physicians across the United States who have demonstrated outstanding leadership and dedication in their respective fields.

Outside of her work, she loves spending time with her family, enjoys gardening, playing tennis and antique shopping.

Deirdre Masterton, MD, is a board-certified obstetrician and gynecologist and has been with Advanced Obstetrics & Gynecology since 2011. She sees patients at our Flemington and Lebanon offices. Patients trust Dr. Masterton with a wide range of conditions and concerns, ranging from family planning to problematic bleeding to navigating the menopausal transition. She is an accomplished laparoscopic surgeon.

She completed her Bachelor’s Degree at Washington and Lee University and her medical training at New York University. She completed her residency training at Women & Infants’ Hospital, affiliated with Brown University in Providence, Rhode Island.

Throughout her education and her career, Dr. Masterton has received numerous awards for her excellence, including the New York University President’s Service Award, the Leonard J. Tow Humanism in Medicine Student Award, the Resident Award for Excellence in Pelvic Surgery, and the American Association of Gynecologic Laparoscopists Award for Special Excellence in Endoscopic Procedures. She was also a National Health Service Corps Scholar and spent time working for the Indian Health Service on the Blackfeet Reservation in northwest Montana.

Dr. Masterton loves spending time outdoors with her family at sporting events, hiking, or toiling in her vegetable garden. She became an Ob/Gyn because she wanted to develop long-term patient relationships, to work with her hands, and to help women understand their bodies and live their best lives.

Patricia Ardise, MD, is a trusted, board-certified obstetrician and gynecologist at Advanced Obstetrics & Gynecology, LLC, with locations in Lebanon, Branchburg, and two offices in Flemington, New Jersey. She has a special talent for educating her patients and walking them through their care at every step. With special interests in general and high-risk obstetrics, cervical pathology and colposcopy, minimally invasive surgery, and adolescent medicine, Dr. Ardise works tirelessly to meet patients’ needs at all ages and levels of health.

Dr. Ardise attended Georgetown University in Washington, DC for her undergraduate education, where she graduated in 1995. For her medical education, she attended the State University of New York at Stony Brook in Stony Brook, New York. After completing her residency training there, from 2004-2008, she became an assistant professor in the department of obstetrics and gynecology. During her residency, she earned both the Martin Stone MD Resident of the Year Award and the resident achievement award from the Society of Laparoendoscopic Surgeons.

In addition to teaching future obstetricians and gynecologists, Dr. Ardise has published her own research regarding fetal well-being in the Journal of Maternal-Fetal and Neonatal Medicine. She is also a Fellow of the American Congress of Obstetricians and Gynecologists and a Diplomate of the National Board of Medical Examiners.

Outside of work, Dr. Ardise enjoys spending quality time and traveling with her husband and three children. To stay active, she enjoys running and participating in triathlons.

Katy Hagan, CNM, WHNP-BC, is a certified nurse midwife and women’s health nurse practitioner with over a decade of experience supporting women through pregnancy, labor, birth, and beyond. She provides expert care to patients at Advanced Obstetrics & Gynecology, LLC, with locations in Lebanon, Branchburg, and two offices in Flemington, New Jersey. 

Katy earned her Bachelor of Science in Nursing from the University of Delaware. She spent five years as a labor and delivery nurse in Pennsylvania, gaining hands-on experience in maternal care. She then completed her Master of Science in Nursing at the University of Pennsylvania and launched her career as a nurse midwife in New Jersey.

Katy provides comprehensive prenatal, postpartum, and gynecologic care for women at every stage of life. Her services include well-woman exams, family planning, menopause management, and prenatal care. As a certified first assistant for cesarean sections, she also plays a key role in supporting women who require surgical birth.

Known for her compassionate and patient-centered approach, Katy is passionate about empowering women to make informed choices about their health and birth experiences. She believes in creating a supportive and respectful environment where women feel heard, valued, and cared for.

Now living in Hunterdon County with her husband, two children, and their labradoodle, Katy is excited to serve her local community and provide exceptional women’s health care close to home. 

Dr. Frys graduated from the University of New England College of Osteopathic Medicine. She was extensively trained in minimally invasive surgical approach for the treatment of many common gynecologic issues during her Residency at Newark Beth Israel. Dr. Frys also has a special interest in high-risk obstetrics and has been in private practice for over a decade. Her hands-on medical approach comes from her osteopathic training that focuses on disease prevention and health promotion. 
She enjoys gardening, spending time with her family and is looking forward to again caring for her community! 

Dr. Jimena Rivas is a compassionate OB/GYN at Advanced Obstetrics & Gynecology, LLC, proudly caring for patients in Lebanon, Branchburg and Flemington, New Jersey. She is passionate about guiding women through every stage of life, from pregnancy and postpartum care to menopause and beyond.

Originally from Colombia, Dr. Rivas brings award-winning experience and a global perspective to her practice. She earned her medical degree from the Universidad de Caldas in Manizales and completed her OB/GYN specialization at Rita Arango Alvarez del Pino Medical Center. After moving to the United States, she completed a second OB/GYN residency training at Morristown Medical Center and Overlook Medical Center in New Jersey. She served as Chief Resident and was recognized for her excellence in patient care.

Dr. Rivas is board-certified and a Fellow of the American Congress of Obstetricians and Gynecologist (FACOG). She is fluent in English and Spanish allowing her to connect deeply with patients from diverse backgrounds. She has been honored on Castle Connolly's Top Hispanic and Latino Doctors List in 2022, 2023, 2024 and 2025.

Outside of her professional work, Dr. Rivas enjoys spending quality time with her husband and four children.

Philadelphia Magazine Top Doctors™ 2018: Obstetrics and Gynecology

Sonya Lee, MD is passionate about sharing her expertise in the field of gynecology with her patients in Philadelphia, Pennsylvania. She currently practices at Gynecology Specialists of Philadelphia.

Dr. Lee’s renowned skill in minimally invasive gynecologic surgery has garnered acclaim such as The Award of Excellence in Laparoscopic Surgery from the American Association of Gynecologic Laparoscopists and recognition as a “Top Doc” by US News and World Report.

After receiving her medical degree from the University of Michigan, Dr. Lee completed her residency at Pennsylvania Hospital.

A distinguished leader in women’s health, Dr. Lee served as Director of Gynecology at Graduate Hospital for six years before she was recruited as Chief of Gynecology at Penn Presbyterian Medical Center.

Besides treating patients, Dr. Lee teaches both residents and medical students as an assistant professor at the University of Pennsylvania School of Medicine. Her focus includes comprehensive women’s health, minimally invasive surgery, urinary incontinence, and pelvic organ prolapse.

Dr. Lee’s compassionate approach to patient care includes listening to concerns as well as educating and empowering women to take charge of their health. She knows that every woman is unique and tailors treatment plans to meet each patient's needs.

Philadelphia Magazine Top Doctors™ 2018: Obstetrics and Gynecology

Sonya Lee, MD is passionate about sharing her expertise in the field of gynecology with her patients in Philadelphia, Pennsylvania. She currently practices at Gynecology Specialists of Philadelphia.

Dr. Lee’s renowned skill in minimally invasive gynecologic surgery has garnered acclaim such as The Award of Excellence in Laparoscopic Surgery from the American Association of Gynecologic Laparoscopists and recognition as a “Top Doc” by US News and World Report.

After receiving her medical degree from the University of Michigan, Dr. Lee completed her residency at Pennsylvania Hospital.

A distinguished leader in women’s health, Dr. Lee served as Director of Gynecology at Graduate Hospital for six years before she was recruited as Chief of Gynecology at Penn Presbyterian Medical Center.

Besides treating patients, Dr. Lee teaches both residents and medical students as an assistant professor at the University of Pennsylvania School of Medicine. Her focus includes comprehensive women’s health, minimally invasive surgery, urinary incontinence, and pelvic organ prolapse.

Dr. Lee’s compassionate approach to patient care includes listening to concerns as well as educating and empowering women to take charge of their health. She knows that every woman is unique and tailors treatment plans to meet each patient's needs.

Chike Obianwu, MD, serves Alliance OB/GYN, located in Hainesport and Delran, New Jersey, as board-certified OB/GYN and cosmetic surgeon with advanced training in minimally invasive surgery and robotic surgery, and a special interest in fibroid management. He also has extensive experience in high-risk obstetrics.

Dr. Obianwu received in Bachelor of Science in microbiology from Tulsa University, before going on to get his doctorate of medicine from Ross University. Following medical school, Dr. Obianwu completed a fellowship in minimally invasive cosmetic surgery.

Dr. Obianwu is a Fellow of the American College of Gynecology, a Fellow of the American College of Surgeons, and a Fellow of the American College of Cosmetic Surgery. He’s also a member of the American College of Obstetrics and Gynecology, American Medical Association, American Association of Gynecologic Laparoscopists, American Society for Laparoendoscopic Surgeons, and American Academy for Cosmetic Surgeons.

Before joining the team at Alliance OB/GYN, Dr. Obianwu worked in academics for over 20 years. During that time, he taught, among other places, at the University of Buffalo in Buffalo New York, as a clinical assistant professor. Today, he spends some time as a clinical assistant professor at Drexel University in Philadelphia.

From 2006 to 2016, Dr. Obianwu worked as the chief of Obstetrics at Virtua-Memorial Hospital in Mount Holly, New Jersey. While there, he sat on several committees, took on a variety of leadership roles, and piloted the hospital’s da Vinci® robotic surgery program. He continues to serve on the Virtua Hospital Robotic Steering Committee.

Named Top Doctor in New Jersey, every year since 2010 by various organizations, Dr. Obianwu is one of the most educated, experienced, and sought-after gynecologists around the globe. He’s dedicated to advancing women’s health care and finding new, less invasive ways to treat patients.