About
Dr. David Horowitz is a board-certified internist who has practiced primary care in Smithtown, New York since 1985. He earned his undergraduate degree at Brandeis University and his medical degree at New York University. He completed his internship and residency at Long Island Jewish Hospital. C. followed.
Before entering private practice, Dr. Horowitz served as a full-time faculty member at Stony Brook University School of Medicine from 1983 to 1985. He reached the rank of Assistant Professor of Medicine, contributing to teaching, research, and patient care. In 2010, he established his solo concierge practice to focus on quality over volume. He applies the latest advances in medicine while keeping each visit relaxed and unhurried. He is passionate about proactive care, with particular attention to lifestyle, nutrition, and exercise. Patients reach him directly at any hour on his personal cell phone.
Education & Training
Undergraduate
Brandeis University
Medical School
New York University
Residency
Long Island Jewish Hospital (internship and residency)
Fellowship
Georgetown University, Washington, DC (2-year fellowship in general internal medicine)
Additional Training
Assistant Professor of Medicine, Stony Brook University School of Medicine (1983-1985)
Conditions Treated
Who is Dr. Horowitz right for?
Dr. Horowitz is a strong fit for adults seeking a long-term primary care relationship with an experienced internist. Patients managing chronic conditions benefit from his proactive, prevention-focused approach. Those who value direct physician access will appreciate his personal cell phone availability around the clock. He works well with patients interested in lifestyle, nutrition, and fitness as part of their overall health plan.
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Frequently Asked Questions
Dr. Horowitz treats a broad range of adult internal medicine conditions. His focus includes preventive care, chronic disease management, and proactive health management. He gives particular attention to lifestyle-related concerns, including nutrition and fitness.
Dr. Horowitz has practiced primary care in Smithtown, New York since 1985. That represents four decades of experience in internal medicine. He established his concierge practice in 2010 to focus more deeply on each patient.
Dr. Horowitz earned his medical degree at New York University. He completed his internship and residency at Long Island Jewish Hospital. He then completed a two-year fellowship in general internal medicine at Georgetown University in Washington, DC.
Yes, Dr. Horowitz holds board certification in internal medicine. He has maintained this credential throughout his decades-long career in primary care.
Yes, Dr. Horowitz served as a full-time faculty member at Stony Brook University School of Medicine from 1983 to 1985. He reached the rank of Assistant Professor of Medicine. His role included teaching, research, and direct patient care.
Yes, Dr. Horowitz makes himself available to patients around the clock on his personal cell phone. This direct access is a core feature of his concierge practice.
Dr. Horowitz applies the latest advances in medicine while keeping each visit relaxed and unhurried. He focuses on proactive care and places particular emphasis on lifestyle, nutrition, and exercise. His goal is to address health concerns before they become serious problems.
Dr. Horowitz holds affiliations with Saint Catherine of Siena Hospital in Smithtown and Stony Brook University Medical Center. He coordinates care with specialists at both institutions when patients need additional support.
Doctor profile last updated March 21, 2026