Our Surgeons and Providers


Physician Assistant


Rafael Attiya, MD, FACS
Board-Certified General Surgeon

Attiya Rafael MD FACS"I take the time to discuss my patient's conditions and answer their questions. I believe this helps my patients have better outcomes and be more satisfied with their care."


Rafael Attiya, MD, FACS, is a board-certified general surgeon who worked in private practice for nearly two decades before he joined AtlantiCare Physician Group (APG) Surgical Associates in 2014. He began his medical career at the University of Medicine and Dentistry in Newark, New Jersey, where he received a medical degree in 1992.

Dr. Attiya completed his post-graduate education at the Montefiore Medical Center/Albert Einstein College of Medicine in Bronx, New York, followed by a general surgery residency at the Hahnemann University and Medical College of Pennsylvania in Philadelphia, where he was appointed administrative chief resident. He has a special interest in laparoscopic and open hernia repair, gallbladder, colorectal surgery, benign and malignant skin lesions.

Dr. Attiya is a Fellow of the American College of Surgeons and is certified by the American Board of Surgery. His professional memberships include the American Medical Association, the Medical Society of New Jersey, and the Atlantic County Medical Society.


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Gregory Domer, M.D., FACS, FACA, FISVS
Medical Director, Vascular Surgeon

Domer Gregory S MD FACS"“I am dedicated to providing exceptional care to my patients. Vascular surgeons are the only medical specialists trained to provide comprehensive care to patients with all stages of vascular disease. This includes both percutaneous and traditional open surgical procedures, as well as medical management, prevention, diagnosis, and all aspects of vascular care.”

Gregory Domer, M.D., FACS, FACA, FISVS, is an AtlantiCare specialist who cares for patients with peripheral vascular disease, aneurysmal disease, and venous disease. He is highly skilled in treatment of carotid disease, endovascular aneurysm disease, and minimally invasive treatment of all aspects of vascular disease, with a special interest in treating carotid disease, thoracic and abdominal aortic aneurysms.

Dr. Domer received his Doctor of Medicine degree in 1994 from St. George’s University School of Medicine in
Grenada, West Indies. He completed his surgical residency at Mt. Sinai St. Luke’s - Roosevelt in New York, where he was chief surgical resident from 2000-2001. His post-doctoral training also includes a vascular surgery fellowship, which he completed at University of Medicine and Dentistry Robert Wood Johnson Medical School in New Brunswick, New Jersey, and an endovascular fellowship, which he completed at Union Memorial Hospital in Baltimore.

In addition to his clinical practice, Dr. Domer serves as program director of the vascular surgery fellowship at Philadelphia College of Osteopathic Medicine (PCOM), as well as clinical associate professor of surgery at PCOM and clinical assistant professor of surgery at Temple University School of Medicine in Philadelphia.

He is board certified in vascular surgery and is also certified in hyperbaric medicine. In addition, Dr. Domer is a fellow of the American College of Surgery, the American Society of Angiology, and the International Society for Vascular Surgery. He also belongs to numerous professional medical societies, including the Society for Vascular Surgery, Delaware Valley Vascular Society, International Society of Endovascular Specialists, American Association for Vascular Surgery, American College of Surgeons, and Undersea and Hyperbaric Medical Society.

He has published multiple journal articles and book chapters on endovascular therapy and served as sub-investigator on several FDA-sanctioned clinical trials relating to endovascular surgery and intervention.

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Tiffany Fancher, MD

Board-Certified and Fellowship-Trained Colon and Rectal Surgeon

Fancher Tiffany T MD"I offer experience with empathy and attention to detail. I have dedicated my training to the treatment of all colon and rectal problems. Exceptional patient outcomes and comfort are my primary goals." 

Tiffany Fancher, MD, FACS, specializes in comprehensive services in colon and rectal surgery, colonoscopy, laparoscopic and robotic surgery, and the treatment of anorectal disease. She also has an interest in the management of women’s pelvic floor disorders, such as fecal incontinence.

Dr. Fancher completed medical school at American University in St. Maarten and her general surgery residency at Yale-St. Mary’s Hospital in Waterbury, Connecticut. During her residency, Dr. Fancher was awarded the resident teaching award and several awards for outstanding clinical research.

During her residency training, Dr. Fancher was accepted as a post-doctorate fellow at Yale University and subsequently was awarded the sole Colorectal Surgery fellowship position in Connecticut at St. Francis Medical Center, Hartford.

In addition to being dual board certified in colon and rectal surgery and general surgery, Dr. Fancher is a member of the Society of American Gastrointestinal and Endoscopic Surgeons, the American College of Surgeons, the American Society of Colon and Rectal Surgeons, and the Association of Women Surgeons.

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Duane Monteith, MD
Thoracic Surgeon

Monteith Duane R MD" I believe in the importance of patient-centered care. This includes building strong relationships with my patients not only by taking the time to discuss their disease and treatment goals, but also by taking into consideration any other factors that may be affecting their overall well-being."

Duane R. Monteith, MD, is a board-certified cardiothoracic surgeon. He is a member of Jefferson Health, and is on staff at AtlantiCare Regional Medical Center (ARMC). Dr. Monteith currently sees patients in Egg Harbor Township and Cape May Court House, N.J. Dr. Monteith earned a medical degree from Howard University College of Medicine, Washington, D.C., in 2002. He completed post-graduate surgical training at the State University of New York Health Science Center in 2007 and a cardiothoracic fellowship at New York University Medical Center in 2011.

His areas of interest include thoracic oncology (cancer of the lungs, chest, or esophagus), minimally invasive and robotic -assisted thoracic surgery, and endoscopic interventions.

Dr. Monteith is an associate member of the American College of Surgeons and a member of the Society of Thoracic Surgeons and the Medical Society of New Jersey.

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Alexander Onopchenko, MD, FACS, FASMBS
Medical Director, APG Surgical Services
General, Laparoscopic and Bariatric Surgeon

Onopchenko Alexander

Dr. Onopchenko graduated from Ursinus College with a B.S. in Biology in 1979 on the Dean’s Academic Honors list. He obtained his doctorate in medicine from the Medical College of Pennsylvania in 1984 with honors, completed a residency in general surgery at the University of Medicine and Dentistry of New Jersey in 1989, and has been a practicing general surgeon in Atlantic County since July of 1989.

Dr. Onopchenko is board-certified in general surgery, and is a fellow of the American College of Surgeons. He is also an active member of the American Society of Bariatric Surgery and presented a paper on identification of internal hernia after gastric bypass at the 2005 national ASBS meeting.

Dr. Onopchenko is a member of the Society of Laparoendoscopic Surgeons, the Society of Abdominal and Gastrointestinal Endoscopic Surgeons (SAGES), past president of the Medical Society of New Jersey, Atlantic County, and past president and member of the AtlantiCare Regional Medical Center Medical Staff. Since 1990, Dr. Onopchenko’s special interest has been in minimally invasive surgery. He was one of the first surgeons to perform a laparoscopic cholecystectomy in Atlantic County, as well as performing other advanced minimally invasive laparoscopic procedures including appendectomy, inguinal, abdominal and paraesophageal hernia repairs, anti-reflux gastric surgery, gastric and colon surgery, and adrenal surgeries.

In March of 2002, Dr. Onopchenko founded the Center for Surgical Weight Loss & Wellness at AtlantiCare and has extensive experience in performing Laparoscopic Bypass and LAP-BAND® surgeries. Dr. Onopchenko is also a member of the American Society of Bariatric Physicians and has passed both the written and oral exams leading to certification by the American Board of Bariatric Medicine, the only surgeon in Southeastern New Jersey to achieve this.

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Lucian Panait, MD, FACS
General, Laparoscopic and Bariatric Surgeon

Panait Lucian MD FACSLucian Panait, MD, FACS, is a bariatric surgeon for the Center for Surgical Weight Loss & Wellness at AtlantiCare. He specializes in bariatric surgery, with special emphasis on laparoscopic gastric bypass, laparoscopic sleeve gastrectomy, and revisional procedures. Dr. Panait also has a particular interest in robotic and other minimally invasive surgical techniques with applications to the treatment of benign gallbladder disease, hematologic disorders of the spleen, abdominal wall and hiatal hernias, gastro-esophageal reflux disease, achalasia and gastroparesis. 

Dr. Panait received his Medical Doctor degree from Ovidius University in Constanta, Romania. After a few years of research in a NASA-sponsored laboratory at Virginia Commonwealth University assessing telemedicine and laparoscopic surgery capabilities for space flight, he completed a general surgery residency program at St. Mary's

Hospital/Yale Affiliate in Waterbury, Connecticut, where he won the "Distinguished Research Achievement Award" in 2011. He continued his training with a fellowship in Minimally Invasive and Bariatric Surgery at Yale University, in New Haven, Connecticut, where he also served as a clinical instructor in the Department of Surgery. Dr. Panait

subsequently joined the faculty at Drexel University as assistant professor of surgery and practiced in the Center for Surgical Weight Loss at Hahnemann University Hospital in Philadelphia, Pennsylvania, until joining AtlantiCare. 

Dr. Panait has a long track of research and published numerous articles on topics related to surgical simulation, new minimally invasive surgery techniques, and robotic surgery. He is board certified by the American Board of Surgery and is a fellow of the American College of Surgeons, and a member of the Society of American Gastrointestinal and Endoscopic Surgeons, American Hernia Society, and Association for Academic Surgery.

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Samir Patel, MD, FACS, FASMBS
General, Laparoscopic and Bariatric Surgeon


Dr. Samir Patel was born and raised in New York City. He attended the Bronx High School of Science, where he was a member of the fencing team. A graduate of Cornell University with a degree in biochemistry, Dr. Patel studied medicine at the Albert Einstein College of Medicine where he graduated with honors. Dr. Patel did his residency in general surgery at State University of New York at Brooklyn. After completing his residency, he did a fellowship in Advanced Laparoscopy and Bariatric Surgery at the Staten Island University

Hospital under the tutelage of George Ferzli, M.D. world-renowned laparoscopic surgeon. Dr. Samir Patel has published several articles about laparoscopy and bariatric surgery. He is currently a member of the Society of the American Gastrointestinal Endoscopic surgeons (SAGES), American Society of Metabolic and Bariatric Surgery (ASMBS), Society of Laparoendoscopic Surgeons, American College of Surgeons (ACS), and the American Medical Association (AMA).

Bariatric medicine is the medical management of obesity, focusing on a multidisciplinary approach to weight loss and maintenance, including treatment options in the following areas designed specifically for each patient: behavior and lifestyle modification; diet, nutrition and metabolism; exercise options and pharmacotherapy.

Bariatric Surgery Center of Excellence - We have been designated by the American Society for Metabolic & Bariatric Surgery (ASMBS) as a Bariatric Center of Excellence since 2005. This designation recognizes a demonstrated track record of favorable outcomes in bariatric (weight loss) surgery. AtlantiCare was re-accredited by the ASMBS in 2009. High Level of Patient Satisfaction- Over 80% of AtlantiCare's Bariatric patients scored their "Overall Quality of Care" as "Excellent". Our Bariatric program places a great deal of importance on customer satisfaction -we strive to make our patients' experience outstanding from start to finish.

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Jay Steinberg, DO

Thoracic Surgeon

Steinberg Jay DO"Although trained as a surgeon with the concept of operating to repair, I have learned that true healing also occurs by the compassionate care we afford to individuals and their families. By treating patients like our own family members, we witness the true power of medicine."

Jay Steinberg, DO, is dually certified by the American Board of Thoracic Surgery in the specialties of cardiac surgery and thoracic surgery. He is a member of Jefferson Health, and is on staff at AtlantiCare Regional Medical Center (ARMC). He sees patients in Egg Harbor Township and Cape May Court House, N.J.

Dr. Steinberg earned a medical degree from the New York College of Osteopathic Medicine. He completed his medical internship and surgical residency at SUNY Upstate Medical University in 2005 and then continued his post-graduate training at the Penn State Milton S. Hershey Medical Center, where he completed a cardiothoracic fellowship in 2007. Dr. Steinberg also completed a fellowship in endovascular surgery at the University of Pittsburgh in 2007.

He is a member of the American Osteopathic Association, the American Medical Association, the Camden County Medical Society, and the Medical Society of New Jersey.


A. Chenée Tyson, MD, RPVI
Vascular Surgeon
Tyson A Chenee MD"I am devoted to excellence in patient care, education, and outreach. My training included a wide spectrum of vascular diseases managed with endovascular and/or open surgical techniques. I strive to make compassionate informed decisions with my patients and referring physicians to optimize the medical and surgical management of vascular diseases."
A. Chenée Tyson, MD RPVI completed her undergraduate education at the University of Rochester in 2006. She then attended the University of Rochester School of Medicine and Dentistry as a member of the REMS (Rochester Early Medical Scholars) BS/MD program graduating in 2010 with Distinction in Community Service.  In 2015, she graduated from the University of Colorado General Surgery Residency program.  She then completed her vascular surgery fellowship at Staten Island University Hospital in 2017.
Dr. Tyson is certified by the American Board of Surgery in general surgery and is also a Registered Physician in Vascular Interpretation. She is a member of the Society for Vascular Surgery and the Society for Clinical Vascular Surgery.  She was a William J von Liebig research fellow at Harvard University in 2009 and continues to have an interest in clinical and academic research. She has since presented abstracts regionally and nationally, and has placed in various competitions, including the Vascular Society of New Jersey and the Annual New York Vascular Fellows Abstract Competition in 2016. 
Dr. Tyson has a wide breadth of training in vascular surgery with a special interest in carotid endarterectomy, endovascular thoracic and abdominal aortic management, and endovascular and open surgical management of peripheral arterial and venous diseases. 

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Physician Assistant

Mariah G. Sykes, MS, PA-C

Certified Physician Assistant
General, Laparoscopic and Bariatric Surgery

Sykes MMariah G. Sykes, MS, PA-C, was born and raised in Ocean City, New Jersey. She is a certified physician assistant specializing in general, laparoscopic and bariatric surgery. She earned a Master of Science degree in physician assistant studies from the Philadelphia College of Osteopathic Medicine and a Bachelor of Science degree in biology from Boston College. She is certified by the National Commission for Certification of Physician Assistants and is a member of the American Academy of Physician Assistants.


In her professional practice, Ms. Sykes stresses the importance of keeping the patient's needs and values as the central focus of the treatment plan and in treating each individual with the highest levels of compassion and dignity. She is proud to be part of an organization that focuses on patient-centered values.


Ms. Sykes completed a three-week volunteer medical mission in Sri Lanka after the Indian Ocean tsunami in 2004 and also has volunteered with Habitat for Humanity.

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Choosing the Right Primary Care Doctor

Whether you’re new to our community, have changed health plans recently, or simply are looking for a new primary care provider, choosing a doctor for routine checkups and primary medical care is one of the most important decisions you will make as a healthcare consumer.