Dr. Mack Sullivan

Dr. Mack Sullivan, MD — A Multi-Disciplinary Physician Bridging Emergency Medicine and Everyday Wellness

In Eastchester, New York, Dr. Mack Lee Sullivan, MD, has built a career that goes well beyond the traditional boundaries of a single specialty. As an Emergency Medicine physician who also holds training in Internal Medicine and Physical Medicine & Rehabilitation, Dr. Sullivan brings a uniquely comprehensive clinical perspective to his patients — one that blends the speed and precision of emergency care with the depth of a long-term primary care relationship.

Education and Training

Dr. Sullivan earned his medical degree from Albert Einstein College of Medicine of Yeshiva University in 1995. He completed two concurrent residencies, both at the Montefiore Medical Center / Albert Einstein College of Medicine complex:

• Residency in Emergency Medicine (Jacobi/Montefiore Campus), 1996–1999
• Residency in Internal Medicine (Moses and Weiler Campuses), 1995–1998

This dual-residency training is exceptionally rare and gives Dr. Sullivan a depth of diagnostic reasoning that most physicians in either specialty alone cannot match. He is currently licensed to practice medicine in New York, New Jersey, and Connecticut.

Practice Location

Dr. Sullivan practices at Fitness And Recovery Medical, located at: 369 White Plains Rd, Suite B, Eastchester, NY 10709

He is affiliated with NewYork-Presbyterian Westchester, White Plains Hospital, and Long Island Jewish Medical Center.

Academic Contributions

Dr. Sullivan is not only a practicing clinician — he has contributed to the academic literature on cardiovascular medicine and emergency toxicology. His published research includes:

• Atrial fibrillation and anabolic steroids — The Journal of Emergency Medicine (1999)
• The cardiac toxicity of anabolic steroids — Progress in Cardiovascular Diseases (1998)
• Reciprocal strains in the normal and ischemic myocardium and their relation to the size of the ischemic region — Journal of the American College of Cardiology (1991)

This research background underscores his deep command of cardiovascular and emergency medicine principles.

Clinical Specialties

Dr. Sullivan sees patients across a wide spectrum of medical needs:

Primary and Preventive Care:

• Annual physicals and wellness evaluations
• Allergy consultations
• Illness management and acute care

Emergency and Urgent Care:

• Rapid diagnosis and treatment of acute conditions
• X-ray interpretation and ordering
• Arthritis and musculoskeletal complaints

Regenerative and Integrative Medicine:

• Regenerative medicine procedures (including knee injections and joint therapies)
• Hormone Replacement Therapy (HRT) and age management
• Physical therapy coordination

Mental Health and Behavioral Medicine:

• Anxiety disorders (particularly in adults and children)
• Obesity and overweight management

Dr. Sullivan is noted for treating anxiety disorders and childhood/adolescent weight concerns more frequently than most providers in similar practices — reflecting his broader interest in the intersection of physical and mental health.

Telehealth Services

Dr. Sullivan offers telehealth and virtual consultations, allowing patients to access his care remotely. He can be reached through his practice at (914) 395-3691.

Accepted Insurance

Dr. Sullivan accepts a range of insurance plans including Aetna, Cigna, Blue Cross Blue Shield, and United Healthcare, as well as Medicare.