About
Jonathan S. Lown, MD earned his biology degree from the State University of New York at Plattsburgh before completing his Doctorate of Medicine at SUNY Downstate in 1995, graduating Magna Cum Laude. He then completed his residency and internship at Columbia Presbyterian Medical Center in New York City. The American Board of Internal Medicine has recognized him as a Diplomate in Internal Medicine since 1998 and in Sleep Medicine since 2009. The American Board of Clinical Lipidology awarded him Diplomate status in 2006. He holds membership in the American Academy of Sleep Medicine, the American College of Physicians, the American College of Chest Physicians, the National Lipid Association, and the Suffolk County Medical Society. The Alpha Omega Alpha Medical Honor Society inducted him during his training. Since 1995, he has served as a Professor and Clinical Preceptor at Stonybrook University Medical School.
Dr. Lown is passionate about helping patients live longer, healthier lives through both acute and preventive care. He treats the full range of primary care and internal medicine concerns, with particular focus on cardiovascular health, lipidology, women's health, and sleep disorders including obstructive sleep apnea, insomnia, and CPAP management. He gives every patient personal, unhurried attention and believes optimism and good humor play a genuine role in healing. He speaks fluent English and Spanish and maintains a hospital affiliation with St. Catherine of Siena Medical Center in Smithtown, New York.
Education & Training
Undergraduate
State University of New York at Plattsburgh, Bachelor of Science in Biology, 1987
Medical School
State University of New York - Downstate, Doctorate of Medicine, 1995, Magna Cum Laude
Residency
Columbia Presbyterian Medical Center, New York, NY, Residency and Internship, 1995-1998
Additional Training
Professor and Clinical Preceptor, Stony Brook University Medical School, 1995-present
Certifications
Languages
English, Spanish
Conditions Treated
Who is Dr. Lown right for?
Dr. Lown is a strong fit for adults seeking a primary care physician with deep expertise in cardiovascular and preventive medicine. Patients managing lipid disorders, heart disease risk, or chronic conditions benefit from his clinical lipidology and internal medicine background. Those dealing with sleep problems, including obstructive sleep apnea, insomnia, or CPAP management, will find focused, knowledgeable care. Spanish-speaking patients find a physician who communicates with them directly in their language. Dr. Lown suits patients who value same-day access and personal attention from a single physician.
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Frequently Asked Questions
Dr. Lown specializes in internal medicine, cardiovascular health, clinical lipidology, and sleep disorders. He treats obstructive sleep apnea, insomnia, and manages CPAP therapy. He also focuses on preventive medicine, women's health, and chronic disease management. His triple board certification allows him to address a broad range of concerns within a single practice.
Yes, Dr. Lown holds three board certifications. The American Board of Internal Medicine recognized him as a Diplomate in Internal Medicine in 1998 and in Sleep Medicine in 2009. The American Board of Clinical Lipidology awarded him Diplomate status in 2006.
Dr. Lown earned his Doctorate of Medicine from SUNY Downstate in 1995, graduating Magna Cum Laude. He completed his residency and internship at Columbia Presbyterian Medical Center in New York City. He also holds a Bachelor of Science in Biology from the State University of New York at Plattsburgh.
Yes, sleep medicine is one of Dr. Lown's core specialties. He diagnoses and treats obstructive sleep apnea, insomnia, and manages CPAP therapy. The American Board of Internal Medicine has certified him in sleep medicine since 2009.
Yes, Dr. Lown holds Diplomate status from the American Board of Clinical Lipidology, a credential he has maintained since 2006. He focuses on lipid management as part of his broader cardiovascular health expertise. This makes him well-suited for patients with elevated cholesterol or complex lipid profiles.
Yes, Dr. Lown has served as a Professor and Clinical Preceptor at Stony Brook University Medical School since 1995. He has maintained that academic role alongside his clinical practice for nearly three decades.
Yes, Dr. Lown speaks fluent English and Spanish. Spanish-speaking patients can communicate with him directly in their preferred language throughout their care.
Dr. Lown holds membership in the American Academy of Sleep Medicine, the American College of Physicians, the American College of Chest Physicians, the National Lipid Association, and the Suffolk County Medical Society. The Alpha Omega Alpha Medical Honor Society inducted him during his training.
Dr. Lown holds an affiliation with St. Catherine of Siena Medical Center in Smithtown, New York.
Doctor profile last updated March 21, 2026