Dr. Greenberg holds Fellowships in the highly selective American Academy of Esthetic Dentistry, the Greater New York Academy of Prosthodontics, the College of Physicians and Surgeons of Philadelphia, and the Academy of General Dentistry. He is former executive director and President of the Charles L. Pincus Foundation, founder and 1st President of “Kids Smiles” a non-profit Community Center for Children’s Dental Health, founding Vice President of The National Children’s Oral Health Foundation, and has served many other non-profit volunteer activities and Boards.  He won the first annual Trudi Birger Award from Alpha Omega International Dental Fraternity (2005) and the Pennsylvania Dental Association Special Community Service Award (2006) for his work with Kids Smiles.

Recently Dr. Greenberg served a term on the Board of Visitors of the Kornberg School of Dentistry at Temple University and remains a special advisor to the Dean.  He has now given over 100 invited lectures to Dentists and dental students all over the world and at his private Teaching Center.

Penn Dental, Penn dual specialty in Periodontics and Fixed Prosthodontics/Periodontal Prosthesis. Penn Dental Faculty since 1973 (Clinical Professor of Periodontics), Kornberg Temple Faculty since 2008 (Clinical Professor of Restorative Dentistry, former Director of Advanced Restorative Dentistry). International lecturer and author, former Team Dentist for the Philadelphia 76ers, former Bryn Mawr Hospital Medical Staff, Founder and first President of Kids Smiles (501c3 non profit), Expert Smile Design on the Main Line since 1978.