He completed his internship at Albert Einstein College of Medicine, Jacobi Medical Center, followed by a residency in Anesthesiology at New York Presbyterian-Weill Cornell Medical Center. He then completed a fellowship in Interventional Pain Medicine in the Tri-Institutional Pain Medicine fellowship at New York Presbyterian-Weill Cornell Medical Center, Hospital for Special Surgery and Memorial-Sloan Kettering Cancer Center. Dr. Shestack is dual board certified in Anesthesiology and Pain Medicine.

Prior to becoming Medical Director at Florida Pain Management Institute, Dr. Shestack was the Director of Outpatient Pain Medicine Services at Syosset and Plainview Hospitals and was a pain management specialist at North Shore University Hospital in Manhasset, New York. While working in the Northwell Health System in New York, Dr. Shestack developed and implemented ketamine infusion therapy protocols for outpatient treatment of chronic neuropathic pain syndromes and for inpatient acute post-operative pain management. He also developed the Outpatient Pain Management Mental Health Center in conjunction with psychiatry and addictionology services for management and treatment of addiction in the setting of chronic pain.

Dr. Shestack has worked with The New York Times for articles on comprehensive pain management and with The Doctors Company for articles on the current opioid crisis. He has also been interviewed for radio broadcast. Dr. Shestack is a member of Palm Beach County Medical Society's Opioid Task Force and an active member of the American Society of Interventional Pain Physicians, American Pain Society, American Society of Anesthesiologists and the Florida Medical Association.

Ultimaxx Health is honored to have him.