Meet Our Doctors

Dr. Mark Dorn

Dr. Mark Dorn was born in Brooklyn, NY and raised in Cedarhurst, NY. He graduated from the University of Cincinnati with a Bachelor’s in Science Biology and pursued a career in General Dentistry at NYU after graduating with his Doctorate in Dental Surgery in 1977.

Dr. Dorn has professionally had the opportunity to run a successful practice for 42 years. He takes an active interest in his patients, not only providing them with outstanding care, but also getting to know them on a personal level. His passion is Restorative Dentistry. He continues to excel by constantly continuing his education in order to keep up with today’s newest technologies in dentistry.

Dr. Dorn has been married to his soulmate for 45 years. They have been blessed with 3 children and 5 grandchildren. He enjoys spending time with his family and traveling in his free time.

Dr. William Brownstein

Dr. Brownstein has been in practice for almost 30 years and has been working on the North Shore in Manhasset during this time. He was born on Long Island and has resided there ever since. He earned his B.A. degree from SUNY Binghamton in Biochemistry in 1982. He then graduated from NYU School of Dentistry in 1986 where he earned his D.D.S. degree. He completed his general practice residency at Long Island Jewish Medical Center, then went on to complete his specialty training at Nassau County Medical Center. He then earned his degree in Endodontics in 1989.

Dr. Brownstein has published many articles in the field of Endodontics and was one of the first to utilize Digital Radiography in New York. He has even appeared on Cablevision to discuss this topic.

Dr. Brownstein has one son, Harris, and enjoys sports, weight training, and automobiles.

Dr. Andrew J. Leder

Dr. Andrew J. Leder is a periodontist at Gramercy Dental Center. Dr. Leder takes a great amount of pride and satisfaction in helping his New York City patients to prevent disease and improve the state of their oral health. Dr. Leder has been highly trained to provide his patients with the most current, innovative surgical and non-surgical techniques that modern dentistry has to offer.

Dr. Leder completed his undergraduate studies at the State University of New York at Albany and was admitted into the Alpha Kappa Delta Honor Society in 1987. He then completed dental school at the State University of New York at Stony Brook School of Dental Medicine, where he graduated with his Doctorate of Dental Surgery. While at Stony Brook, Dr. Leder won the John Oppie McCall Award, which recognizes individuals demonstrating exemplary dedication and proficiency in periodontology. He then went on to complete his specialty training and received his Certificate in Periodontics from the University of Medicine and Dentistry of New Jersey State.

To stay current with the latest treatments and techniques in periodontology, Dr. Leder routinely participates in continuing education courses. His commitment to continuing education allows him to offer the most advanced and highest quality care with successful outcomes.

Dr. Leder maintains membership with several professional organizations, providing him with opportunities for continuing education, including the American Academy of Periodontology, American Dental Association, Northeast Society of Periodontists, Alpha Omega Dental Fraternity, and American Society of Osseointegration.

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