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The Exchange Dental Group


Samuel Kramer, DDS

Assistant Clinical Director

Dr. Kramer has been with The Exchange Dental Group since 1994. He started his career as a general dentist and earned his certificate in endodontics from New York University. Currently, he serves as a clinical assistant professor of endodontics at NYU College of Dentistry. In his role at the practice as assistant clinical director, he provides invaluable insights to the clinical staff. When he is not teaching and mentoring students and peers, Dr. Kramer enjoys maintaining a level of fitness to play competitive softball and spending Sunday mornings in Rockland County.

Dorian Woo

Practice Manager

Dorian has been a vital component of The Exchange Dental Group since 2000, serving the residents and employees of the downtown area through all its changes and challenges. Having grown with the practice, she understands the full scope of services patients have come to know and expect. During her tenure here, she has graduated from file clerk to practice manager. She also completed her bachelor’s degree in Business Management and Finance from Brooklyn College. Outside of the office, she is a brown belt Brazilian Jiu-Jitsu practitioner and salsa dancer who enjoys traveling the world and mentoring youngsters in STEM promotion.

Howard Wimmer, DDS


Dr. Howard Wimmer is a graduate of New York University College of Dentistry, the Magna Institute of Dental Technology and Yeshiva University. He founded this practice in 1982 at
39 Broadway, its current and only location, and actively practiced general and cosmetic dentistry for more than 25 years. In 2007, Dr. Wimmer assumed his current and exclusive role as Director of The Exchange Dental Group.

He is happily married since 1979 to his lovely wife Ellen. They have four wonderful children and seven adorable grandchildren. When not spending free time with his family, he also enjoys reading and a round of golf.

“To yourself and your training be true, and never be false to patients or staff.”