Meet the Doctors

Michael P. Gelbart, DDS

Diplomate of ABOI/ID. American Board of Oral Implantology/Implant Dentistry

There are only a few hundred dentists in the world which hold this status. The ABOI/ID Diplomate designation symbolizes the highest level of competence in implant dentistry. Certification by the ABOI/ID attests to the fact that a dentist has demonstrated knowledge, ability, and proficiency in implant dentistry through a rigorous examination process. It takes years to acheive and requires presenting 100 cases, a written exam and an oral defense of 10 cases. This is what separates Dr. Michael Gelbart from others implant dentists.

Dr. Michael P. Gelbart graduated from New York University in 1975 with a BS degree, and went on to graduate from the NYU School of Dentistry in 1979. In 1980 he established Family Dental Centers in upstate NY, creating practice groups in Poughkeepsie, Fishkill, Brewster, Yonkers, Yorktown Heights and Manhattan.

  • Dr. Gelbart is a former NYU Clinical Assistant Professor, having trained NYU dental students for more than seven years.
  • His continuing dental and medical practice education includes attendance at numerous symposiums and educational forums in implants, sinus lifts and bone augmentation at NYU and The Connecticut Implant Institute.
  • He has also attended practice seminars in the rescue and repair of implants and implant-blades.
  • In 2008, he attended the prestigious Vegas Institute for Cosmetic and Neuromuscular Dentistry.

Dr. Gelbart focuses on keeping up-to-date with all of the latest advancements in dentistry and medical technology, enabling him to practice at the highest level of dentistry and provide the best quality of care in the field. His expertise ranges from the most challenging cosmetic and restorative dentistry treatments to the most complicated dental surgeries performed today.

Dr. Gelbart has been called on to place over 20,000 implants for patients in the US and abroad, with an extremely impressive record of success.

His love and enthusiasm for dentistry, along with his amazing skills, have made him a model that his peers emulate and a consummate dental professional.

Professional Memberships:

  • Diplomate of the American Board of Oral Implantology
  • Diplomate of the International Congress of Oral Implantology
  • Diplomate of the American Academy of Craniofacial Pain
  • Fellow of the American Academy of Implant Dentistry
  • The International Association of Orthodontists
  • American Dental Association
  • New York State Dental Society

Neil Kesselman, D.D.S.

Dr. Neil Kesselman has been practicing dentistry for 30 years.

He received his Bachelors of Science at SUNY Binghamton. Dr. Kesselman then went on to obtain his D.D.S. at the Ohio State University. He has been with Family Dental for over 20 years.

Dr. Kesselman caters to nervous patients and enjoys transforming a patient back into normal function and appearance.

Rebekah Tannen, D.M.D.
Board Certified Diplomate of the American Board of Pediatric Dentistry

Dr. Tannen graduated from Lehigh University with a Bachelor of Science Degree in 1990. She went onto University of Maryland, Baltimore College of Dental Surgery where she completed Doctor of Dental Surgery studies in 1994.

After completing two years of a general practice dental residency at St. Barnabas Hospital and a Fellowship in Special Care Dentistry at The Rose F. Kennedy Center, Albert Einstein College of Medicine Dr. Tannen decided to focus on pediatrics. Dr. Tannen completed her two-year pediatric dental training at St. Barnabas Hospital in 1999.

Upon graduation she began practicing pediatric dentistry in New York City, Dutchess and Putnam County New York while teaching at St. Barnabas Hospital, as an associate attending.

In 2003 she became a Board Certified Diplomate of the American Board of Pediatric Dentistry. She is now committed to treating the patients of Family Dental Group in Fishkill and Brewster New York.

She continues to teach and in 2005 became the Section Chief of the Department of Pediatric Dentistry at St. Barnabas Hospital.

Fernando Ehrhardt D.M.D., M.S.

Dr. Erhardt attended the University of Miami in Florida, receiving a B.S. degree in Biology, a B.A. in Religious Studies, and a minor in Theater Arts. He went on to attend Harvard University School of Dental Medicine and Oral Surgery, completing his degree in 2002.

He performed his residency at Bronx, VA Medical Center. He was part of the Clinical Faculty at Columbia University School of Dental and Oral Surgery until 2006. He is Board Eligible, American Academy of Periodontology.

Vincent Ayuko, D.D.S.

Dr. Ayuko attended dental school at the School Of Dental Sciences at the University of Nairobi, Africa. Upon moving to the United States, he attended New York University, receiving his Doctor of Dental Surgery degree in 2004.

While attending NYU, he worked as an assistant at Family Dental Brewster.

He is an extremely gentle dentist and promises a calm, and pain free visit.

Fred Friedman, D.D.S.

Fred Friedman, DDS received his dental degree from Emory University Dental School in Atlanta, GA and received his certificate in orthodontics from New York University, New York, NY.

Previous to joining the Family Dental Group practice, Dr. Friedman has maintained his own successful private practice.

Dr. Friedman is a member of the American Association of Orthodontists, the American Dental Association, the Ninth District Dental Association of New York, and the Northeastern Society of Orthodontists.

Dr. Friedman specializes in orthodontic treatment for growing children and adults, including but not limited to traditional metal braces, clear (ceramic braces), and Invisalign for teens and adults.

Nicholas Katchun, D.D.S.
Pediatric Dentist

Dr. Katchen received his DDS from Columbia University College of Dental Medicine.

Following the completion of a one year fellowship in special patient care at Helen Hayes Hospital in West Haverstraw, NY, he became certified in dental anesthesiology at Lutheran Medical Center.Having a strong dedication to treating children, especially those with special needs, Dr. Katchen completed his specialty training in pediatric dentistry at Stony Brook University. He is board eligible in both dental anesthesia and pediatric dentistry.

Dr. Katchen is on staff at New York University College of Dentistry as an instructor in pediatric dentistry to pre-doctoral students and Lutheran Medical Center as an attending in anesthesia.

He is a member of the American Dental Association, American Academy of Pediatric Dentistry, and the American Society of Dentist Anesthesiologists. Dr. Katchen is certified in basic life support, advanced cardiac life support, and pediatric advanced life support.

He enjoys reading and is currently learning to speak Spanish.

Eric Oh, D.D.S.
Oral & Maxillofacial Surgeon

Dr. Eric Oh is a surgical specialist in the field of Oral & Maxillofacial
Surgery and Dental Implants.

Dr. Eric Oh grew up in Southern California and completed his dental degree
from University of Southern California with honors. After graduating from
USC School of Dentistry, Dr. Oh moved to New York to pursue his specialty
in Oral & Maxillofacial Surgery at the biggest ADA accredited program in
the country, Montefiore Medical Center/Albert Einstein College of Medicine.
Dr. Oh served as the Chief Resident at Montefiore Medical Center, Beth
Israel Hospital, Bronx Lebanon Hospital, and Jersey City Medical Center
where he received an extensive training in facial truama and reconstructive
surgery, orthognathic surgery, dentaoalveolar and pre-prosthetic surgery,
and bonegrafting and implant surgery.

Dr. Oh has extensive expertise in the treatment planning and surgical
placement of dental implants, placing more than 1000 dental implants during
his career. Dr. Oh is a member of the American Association of Oral &
Maxillofacial Surgery, American Dental Association, New York and New Jersey
State Dental Association, and International Congress of Oral Implantology.


  • B.S. in Biochemistry and Cell Biology University of California, San Diego
  • DDS at University of Southern California, School of Dentistry
  • Certificate in Oral & Maxillofacial Surgery at Montefiore Medical Center