Physician Team

Mathew Rifkin, MD, FACR Mathew Rifkin, MD, FACR
Ultrasound and Abdominal Imaging
Dr. Rifkin, chair of the department of radiology, is board-certified in diagnostic radiology. He earned a medical degree from Albert Einstein College of Medicine, completed a residency in diagnostic radiology at Montefiore Hospital and Medical Center and was fellowship-trained in ultrasound and computed body tomography at The Johns Hopkins University School of Medicine. He is a Fellow of the American College of Radiology, the American Institute of Ultrasound in Medicine, the Society of Radiologists in Ultrasound and the Society of Uroradiology. He is also a professor of radiology at SUNY Stony Brook and New York College of Osteopathic Medicine. Dr. Rifkin most recently served as the chair of radiology at Good Samaritan Hospital in West Islip, and director of radiology at St. Catherine of Siena Medical Center in Smithtown, St. Charles Hospital and Mather Memorial Hospital in Port Jefferson.
Geraldine N. Abbey-Mensah, MD Geraldine N. Abbey-Mensah, MD
Interventional and Diagnostic Radiology and Breast Imaging
Dr. Abbey-Mensah is board-certified in diagnostic radiology, and specializes in interventional radiology as well as breast imaging. She earned a medical degree from the Alpert Medical School of Brown University, Providence, R.I., and completed a diagnostic radiology residency at the State University of New York Downstate Medical Center, where she was also Chief Resident. She then completed a fellowship in interventional radiology at New York-Presbyterian Weill Cornell Medical Center/Memorial Sloan Kettering Cancer Center. Dr. Abbey-Mensah is the recipient of many awards, including the RSNA Roentgen Resident/ Fellow Research Award Radiology and Resident Teacher of Year. She has published extensively in many peer-reviewed prestigious medical journals and is a member of numerous professional societies.
Elliott Eisenberger, MD Elliott Eisenberger, MD
Neuroradiology
Dr. Eisenberger is chief of the section of neuroradiology and is board-certified in diagnostic radiology with a certificate of added qualification in neuroradiology. He was fellowship-trained in neuroradiology at Beth Israel Medical Center in New York, where he also served as chief resident in diagnostic radiology. He completed an internship in medicine at Maimonides Medical Center in Brooklyn. Dr. Eisenberger earned a medical degree from New York Medical College in Valhalla, N.Y. He was most recently on the staff at Good Samaritan Hospital, St. Catherine Medical Center, St. Charles Hospital and Mather Memorial Hospital.
Stacey A. Funt, MD Stacey A. Funt, MD
Oncologic and Abdominal Imaging
Dr. Funt is board-certified in diagnostic radiology. She obtained her medical degree from New York University School of Medicine and completed a body imaging fellowship at New York University Medical Center, a diagnostic radiology residency at The Mount Sinai Medical Center, and a transitional internship at St. Vincent's Hospital in New York City. She was most recently on staff at Good Samaritan Hospital, St. Catherine of Siena Medical Center, St. Charles Hospital and Mather Memorial Hospital.
Stephen M. Henesch, DO Stephen M. Henesch, DO
Pediatric Radiology
Dr. Henesch is chief of the section of pediatric radiology and is board-certified in diagnostic radiology with a certificate of added qualification (CAQ/board certification) in pediatric radiology. He earned a medical degree from New York College of Osteopathic Medicine (NYCOM). He completed a pediatric radiology fellowship at The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine following a residency in diagnostic radiology at the University of Connecticut School of Medicine, where he also served as chief resident. Dr. Henesch has authored several chapters in Caffey's Pediatric Diagnostic Imaging - the gold standard of pediatric radiology reference books. He is a member of the Society of Pediatric Radiology and has received the Patient's Choice Award and Compassionate Doctor recognition from vitals.com. He was most recently on staff at Good Samaritan Hospital, St. Catherine of Siena Medical Center, St. Charles Hospital and Mather Memorial Hospital, where he was director of pediatric radiology for all sites.
Andrew J. Hwang, MD Wan C. Kim, MD
Staff Radiologist
Dr. Kim is board-certified in diagnostic radiology. He earned a medical degree from Catholic Medical College, Seoul, Korea and completed residency training at Catholic Medical College and St. Luke's-Roosevelt Hospital in New York City. He recently served as diagnostic radiologist for New York Radiology Alliance/Imaging Advantage Corp., which provides interpretive radiologic services for five Long Island hospitals. Prior to joining South Nassau Communities Hospital, Dr. Kim worked as a staff radiologist at St. John's Episcopal Hospital in Far Rockaway, NY. Since 2002 Dr. Kim has been a staff radiologist at four Catholic Health Services of Long Island Hospitals, as well as Brookhaven Memorial and Mather Memorial Hospitals.
Stephen W. Lastig, MD Stephen W. Lastig, MD
General Radiology and Abdominal Imaging
Dr. Lastig is board-certified in diagnostic radiology. He served as the chair of the Department of Radiology at South Nassau Hospital for 15 years. He completed undergraduate and medical degrees at Adelphi University and SUNY Downstate Medical Center. He completed a residency in diagnostic radiology at Nassau County Medical Center and a fellowship in body imaging at University Hospital, Stony Brook. A former president of the Long Island Radiological Society. Dr. Lastig has been on staff at South Nassau Communities Hospital for most of the time since 1996.
David Pfeffer, MD David Pfeffer, MD
Staff Radiologist
Dr. Pfeffer most recently served as an attending radiologist at Good Samaritan Hospital and affiliates, where he provided full time multimodality coverage, and has functioned as the director of PET Imaging. His areas of expertise include body imaging (with MR), ultrasound and nuclear medicine. He earned a medical degree from New York Medical College in Valhalla, completed an internship in internal medicine at University Hospital/UMDNJ and a residency in diagnostic radiology at North Shore University Hospital in Manhasset. He was fellowship-trained in body imaging at Mount Sinai Medical Center. He is board-certified in diagnostic radiology.
Vinh Q. Phan, MD Vinh Q. Phan, MD
Staff Radiologist
Dr. Phan is board-certified by both the American Board of Radiology and the American Board of Emergency Medicine. He earned a medical degree from the University of California, San Diego School of Medicine. He completed residencies in emergency medicine at Mount Sinai Health System and in radiology at North Shore/LIJ Staten Island University Hospital and completed a musculoskeletal fellowship at the Hospital for Special Surgery, Weill Cornell Medical College.
Douglas W. Silfen, MD Douglas W. Silfen, MD
Nuclear Medicine, Interventional Radiology and Abdominal Imagingy
Dr. Silfen is chief of the section of nuclear medicine and is board-certified by both the American Board of Nuclear Medicine and the American Board of Radiology. He earned a medical degree from the Mount Sinai School of Medicine, was fellowshiptrained in angio/interventional radiology at Temple University Hospital in Philadelphia, Penn., and in body imaging at North Shore University Hospital. He completed a radiology residency at New York Medical College, Valhalla, and a nuclear medicine fellowship at the Hospital of the University of Pennsylvania. Previously, he served as chief of nuclear medicine at Good Samaritan, St. Catherine Medical Center and St. Charles Hospital, where he led the nuclear medicine program.
Ari M. Steiner, MD Ari M. Steiner, MD
Abdominal Imaging and PET-CT
Dr. Steiner is chief of the section of abdominal imaging and is board-certified in radiology. He earned a medical degree from Albert Einstein College of Medicine, completed a residency in diagnostic radiology at Montefiore Medical Center and was fellowship-trained in body imaging at North Shore University Hospital. Dr. Steiner has extensive experience in pelvic floor imaging and is well-known to the South Nassau community, having worked at the hospital for several years. He holds an academic appointment of Clinical Professor at the Hofstra North Shore-LIJ School of Medicine.
Sydney S. Yoon, MD

Sydney S. Yoon, MD
Interventional Radiology and Neuroradiology

Chief of the section of interventional radiology, Dr. Yoon has worked at South Nassau for a number of years. He is board-certified in diagnostic radiology and internal medicine and also has certificates of added qualification in interventional radiology and neuroradiology. He has extensive experience in fibroid embolization and other vascular and interventional procedures. After earning a medical degree from the University of Chicago, he completed residencies in radiology at Ronald Reagan UCLA Medical Center and medicine at Johns Hopkins Hospital, a fellowship in interventional radiology, also at the Ronald Reagan UCLA Medical Center and a fellowship in neuroradiology at Columbia University College of Physicians and Surgeons. Dr. Yoon is also a senior member in the American Society of Neuroradiology, is a former referee for the American Journal of Neuroradiology and previously served as chief of neuroradiology at St. Francis Hospital in Roslyn.

 

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