Huntington Family Medicine 

Elizabeth Sullivan, DO

Dr. Sullivan is a graduate of Villanova University with a BS degree in Business Management and a double minor in Comprehensive science and women studies.  She earned her medical degree at New York College of Osteopathic Medicine, while concurrently earning a masters degree in Neuromusculoskeletal Science.  She then completed 2 years of residency at Geisinger Medical Center in Obstetric and Gynecology, followed by a Family Medicine residency at Williamsport Regional Medical Center.  

Dr. Sullivan is currently a Clinical Assistant Professor at NYIT / New York College of Osteopathic Medicine, helping train future physicians.  

She is board certified in Family Medicine and is a member of The American Academy of Family Medicine, American Osteopathic Association, and is a member of the PA Medical Society.  

Our physicians are board-certified specialists in their fields of medicine. ​​
 With a combined experience of over 10 years,
you're in good hands with us.
Our physicians are committed to meeting the needs of their patients and staying actively involved in every aspect of their patient's care.  

Call now (631) 546 - 8953

Same Day Appointments Available

Juan Lessmann, MD

Dr. Lessmann is a graduate of Razetti Medical School in Venezuela, where he earned his medical degree.  He worked for 2 years in medical research at The Feinstein Institute for Medical Research at North Shore/LIJ prior to starting his residency training.  He completed his General Surgery residency at New York Hospital in Queens, NY, followed by a fellowship in Colorectal Surgery in Salt Lake City, Utah. 

Dr. Lessmann has been an attending physician to the medical students at the Commonwealth Medical College, PA.  

Dr. Lessmann is board certified in both general surgery and colorectal  surgery.