Meet Our Physicians

Meet Our Physicians

A highly trained staff is the perfect compliment to our state of the art equipment.  At Avicenna, you are in great hands.  Our team of physicians and surgeons are all fully qualified to handle your surgical procedures with care and accuracy.  Both our medical staff and surgical staff are here to help, feel free to contact us.

Orthopedic Surgeons

DR SEAN THOMPSON, Board Certified

Dr. Sean Thompson is a warm, friendly orthopedic surgeon with a great reputation. Originally from Long Island, Dr. Thompson now treats patients from across the Tri-state area. The goal of his practice is to provide quality orthopaedic care to meet the needs of patients from all backgrounds. Having completed a fellowship in joint replacement, Dr. Thompson also offers services including shoulder, hip, and knee replacement and revision, arthroscopy, and other surgical procedures for the hip, knee and shoulder. His approach is to listen and learn from his patients, who appreciate his bedside manner.

When he is not in the office, Dr. Thompson involves himself in community outreach programs and mentoring youth interested in medicine. He volunteers his time as an orthopaedist in underserved communities of the US and the Caribbean. He also enjoys coaching sporting events, golf, playing the saxophone and exotic cars.


RAZ WINIARSKY MD, Board Certified

Dr. Raz Winiarsky is a Board Certified Orthopedic Surgeon with over 20 years experience. He graduated from Albert Einstein College of Medicine. He completed a surgical internship followed by a residency program in orthopedic surgery at the University of Pennsylvania Hospital. Dr. Winiarsky also completed an adult reconstruction fellowship at the Hospital for Special Surgery in New York City.

Dr. Winiarsky has a number of academic appointments and is affiliated with the following:

  • Assistant Professor of Orthopedic Surgery at SUNY Downstate

  • Physician Assistant Preceptor, Catholic Medical Center, New York, NY

  • Physician Assistant Preceptor, Cornell Medical Center, New York, NY

  • Orthopedic Consultant, Stryker Orthopedics

Dr. Winiarsky is also affiliated with the following medical centers:

  • Flushing Hospital, Forest Hills, NY

  • New York Community Hospital, Brooklyn, NY

  • Victory Memorial Hospital, Brooklyn, NY

  • Lutheran HealthCare, Brooklyn, NY


RANDALL V. EHRLICH MD, Board Certified

Randall V. Ehrlich, M.D. is a board certified orthopaedic surgeon specializing in sports medicine, arthroscopy, and reconstruction of the shoulder and knee. He received his undergraduate degree at Cornell University and attended medical school at the Columbia University College of Physicians and Surgeons.

He completed his orthopaedic surgery residency at the Columbia- Presbyterian Medical Center, and followed this with a fellowship in sports medicine and arthroscopy at NYU / The Hospital for Joint Diseases.

In addition to practicing medicine, Dr. Ehrlich is an instrument rated pilot and an avid competitor in multi-sport events. He has finished six New York City Marathons as well as over 60 triathlons, including the Ironman.



Dr. Kramer is a compassionate and skilled surgeon with greater than 25 years of experience. Staying current with literature, and the newest, most innovative surgical procedures are always a top priority for him. Dr. Kramer has the utmost respect for his colleagues in and outside the field of Orthopaedic Surgery and is always looking forward to learning from others and having others learn from him.

Dr. Kramer is a Fellow of the American Association of Orthopaedic Surgeons (AAOS) and an active member of the New York State Medical Society and the Westchester County Medical Society. He is also the former team physician for the Pace University Football Team and currently serves as the surgeon for the Mount Vernon Police and Fire Departments.



Dr. W. Joseph Gorum, MD, treats patients in Manhattan, Brooklyn and Queens. He received his Bachelor’s Degree from Howard University before attending Drexel University where he received his medical degree. He completed his residency in orthopedic surgery at the Hahnemann University Hospital and completed a fellowship in orthopedic trauma surgery at Mount Sinai School of Medicine.


Podiatric Surgeons

Haleh Nassiri DPM

Dr. Nassiri earned her Bachelor of Science in Molecular Cellular Biology, from the University of California Berkeley. She completed the Doctorate of Podiatric Medicine program, in 2010 from the Samuel Merritt University College of Podiatric Medicine in California.
She then proceeded with residency training in Podiatric medicine and sur-gery at St. John’s Episcopal Hospital and subsequently completed 3rd year of surgical training at Mount Sinai Medical Center. Her training included emphasis on foot and ankle reconstruction surgery, wound care, and man-agement of limb threatening infections.
In 2013 Dr. Nassiri started working at Medalliance health services in the department of Podiatry & Reconstructive Foot Surgery. She is highly trained in both conservative and surgical treatment of the foot. Her goals are to offer patients the latest in conservative and surgical treatment op-tions, and fastest possible recovery.


BORIS CHUSID MD, Board Certified

As a board-certified gastroenterologist, Dr. Chusid has extensive experience diagnosing and treating a broad array of gastrointestinal diseases and disorders, including diarrhea, gastroesophageal reflux disease (GERD), hemorrhoids and hepatitis, using the most advanced diagnostic techniques and minimally-invasive methods, including colonoscopy, endoscopy, gastroscopy and fecal transplant to achieve optimal results in every patient.

Dr. Chusid personally performs over 3500 endoscopic procedures per year with particular emphasis on colonoscopy, hemorrhoid ligation, ercp, difficult polypectomies as well as upper endoscopy. Dr. Chusid has performed over 35,000 endoscopic procedures and personally consults on over 6000 patients per year. Dr. Chusid has been an Endoscopy proctor at Lenox Hill Hospital since July 2001. Dr. Chusid also treats Inflammatory bowel disease.

Dr. Chusid earned his medical degree from Brown University, followed by an internship, residency and fellowship in gastroenterology at Lenox Hill Hospital in New York City. With more than 35,000 endoscopic procedures to his credit, Dr. Chusid is committed to ensuring each patient he treats receives the most advanced, safest and most appropriate care for their individual needs. His compassionate approach to care and his dedication to providing patients with the information and education they need to make informed, confident decisions has earned him top ratings from his patients and his peers.



RAY MERCADO, DO, Board Certified

Dr. Ray Mercado is a board certified obstetrician/gynecologist in the Bronx, New York. He is a nationally renowned Physician who has published 4 textbooks, authored over 60 articles and appeared on numerous Television interviews.

Dr. Ray Mercado is an Associate Professor of Obstetrics and Gynecology at Weill Cornell Medical College. He received his education and medical training at New York College of Osteopathic Medicine, and completed his training at New York Methodist Hospital. Dr Mercado was Chairman of the Department of Obstetrics and Gynecology at Lincoln Hospital for 16 years prior to opening the Comprehensive Medical Care office at 1931 Williamsbridge Road, Bronx New York. He is available for GYN consults every Tuesday morning at Medalliance, 625 East Fordham Road, Bronx, NY 10458.


Pain Management

Richard A. Gasalberti MD, Board Certified PMR

Richard Gasalberti is a trusted and reliable physiatrist and sports medicine specialist serving the community of Forest Hills, NY. Dr. Gasalberti obtained his medical degree from the Ross University School of Medicine. He completed his residency in physical medicine and rehabilitation at the Mount Sinai Hospital and residency in general surgery at Booth Memorial Medical Center. He also completed his fellowship in sports medicine at Hospital For Joint Diseases.

He is board certified by the American Board of Physical Medicine and Rehabilitation. He is a member of the American College of Sports Medicine, the American Academy of Sports Physicians, and the American Academy of Electrodiagnostic Medicine. He was recognized as one of the top doctors by the New York Magazine several times.


Ali E. Guy MD, Board Certified PMR

Dr. Ali Guy is a medical doctor with formal training in Internal Medicine at Mt. Sinai Medical Center as well as Physical Medicine & Rehabilitation. In addition Dr. Guy was also trained in General Surgery at Cabrini Medical Center. He has practiced medicine since 1985. Dr. Guy is board certified in Physical Medicine & Rehabilitation andDiplomate of the American Board of Physical Medicine and Rehabilitation. Currently Dr. Guy is a clinical instructor of physical medicine and rehabilitation at NYU School of Medicine NYU Medical Center. Dr. Guy is an expert witness in disability evaluations and is experienced in a variety of medical legal issues. Dr. Guy has spoken at many state and national events and seminars.


VADIM KUSHNERIK MD, Anesthesiology

Dr. Kushnerik provides comprehensive diagnostic and therapeutic services with state of the art equipment and technology. We use the latest techniques and management protocols with over fifteen years of experience as leader in the specialty of pain medicine.

Dr. Vadim Kushnerik is a Pain Management Specialist, treating patients in New York City and the surrounding communities. He graduated from Stony Brook Medical School. He completed internship in Internal Medicine at Long Island Jewish Medical Center. He completed residency in Anesthesiology at New York Presbyterian Hospital, Columbia-Presbyterian Medical Center. He completed fellowship in Interventional Pain Management at New York Presbyterian Hospital, Columbia-Presbyterian Medical Center and at New York Hospital, Weill Cornell Medical Center. In the office you will find spoken English, Spanish, Russian and Chinese.