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The Exchange Dental Group


Dedicated Staff

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.”

Susan Albano, DMD


Dr. Susan Albano was born and raised in Bergen County, New Jersey. After graduating Fair Lawn High School she attended Rutgers College at Rutgers University where she earned a Bachelor of Art degree. She continued her education for an additional six years attending New Jersey Dental School at the University of Medicine and Dentistry of New Jersey, which awarded her a Doctor of Dental Medicine degree and a postgraduate specialty certificate in prosthodontics. The program training included intensive implant and cosmetic aspects of dental care. Dr. Albano comes from a large family of dedicated medical and dental professionals and truly cares about her patients.

She has been happily living in Battery Park City since 2005 with her husband, who is also a dentist, and her two teenage daughters. In her spare time she enjoys photography, cooking and skiing.

Sasha Alexander, DDS


Sasha Alexander, DDS, is a 2007 graduate of the State University of New York-Buffalo School of Dental Medicine, where he graduated Magna Cum Laude and holds a post- graduate degree from the Columbia University School of Dental Medicine in Endodontics. He also completed a General Practice Residency at the renown Rush University Medical Center in Chicago where he engaged in research geared towards educating dentists in the proper treatment planning of root canal therapies and implant cases. He has been awarded the Tucker Scholarship for academic performance and the Outstanding Achievements Award in Periodontics presented by the American Academy of Periodontology. He also has several awards in Chemistry and Biochemistry. It would be hard to find an Endodontist more qualified to treat our patients.

Dr. Alexander has reached out to the community at large to offer his help and support to underserved communities in the Dominican Republic and Mexico, as well as being a volunteer dentist to the New York State Special Olympics Athletes. We are immensely proud to have such a well rounded and generous humanitarian performing specialized root canal procedures for our patients.

David Berkower, DDS

Pediatric Dentist

Dr. David Berkower was born and raised in Staten Island, New York and graduated from Yeshiva University. He then received his Doctor of Dental Surgery degree from Columbia University College of Dental Medicine. After finishing dental school, he completed a two year residency in pediatric dentistry in Tucson, Arizona, serving as chief resident in his second year. He then returned to New York to continue his career as a pediatric dentist. He enjoys playing basketball, traveling, spending time with friends and family, and rooting for the Mets, Nets and Jets. Dr. David is a member of the American Dental Association and the American Academy of Pediatric Dentists.

Yael Feldman, DMD

Pediatric Dentist

Dr. Yael Feldman is a board certified pediatric dentist. Dr. Feldman graduated from the University of Medicine and Dentistry of New Jersey Dental School in 2003. She then went on to complete a general practice residency through Montefiore Medical Center at Jacobi Hospital. Dr. Feldman completed her specialty training in pediatric dentistry at St. Barnabas Hospital.

In March 2008, Dr. Feldman became a Diplomate of the American Board of Pediatric Dentistry. She won the Richard R. Pugh Achievement Award for scoring in the top 3% on her board exam. Dr. Feldman is currently a member of the American Academy of Pediatric Dentistry, The New York Academy of Pediatric Dentistry and the New Jersey Academy of Pediatric Dentistry. She has been with the Exchange Dental Group since 2006, and also works as an attending at SBH Health System training future pediatric dentists.

Dr. Feldman strives to provide a comfortable, professional and easy visit for every child. She is committed to providing the highest level of care for your children. Dr. Feldman excels at putting both the child and parent at ease throughout the dental experience.

In her spare time Dr. Feldman enjoys reading, cooking, and spending time with her husband and four daughters.

Todd Goldstein, DDS

General Dentist

Dr. Todd Goldstein received his Bachelor of Science in Biology from the University at Stonybrook and his Doctor of Dental Surgery degree from University at Buffalo School of Dental Medicine. After his dental school graduation in 1996, Dr. Goldstein completed a one year general practice residency at Maimonides Medical Center in Brooklyn, New York. Since then, Dr. Goldstein has completed thousands of hours of advanced continuing dental education with an emphasis on cosmetic, restorative and implant dentistry.

Dr. Goldstein is a member of several distinctive dental societies including the American Dental Association, Academy of General Dentistry and the Seattle Study Club, and holds a Fellowship in the International Congress of Oral Implantology. In 2005, Dr. Goldstein and his family had relocated to Florida where he had practiced for five years. Prior to moving to Florida, Dr. Goldstein had spent several years working in the office of The Exchange Dental Group. In 2010, Dr. Goldstein returned to New York City and is again practicing as an associate at The Exchange Dental Group.

Revital Kleiman, DDS

General Dentist

Dr. Revital Kleiman graduated from New York University College of Dentistry. After obtaining her Doctor of Dental Surgery degree from NYU, she trained for two years in a general practice residency program at Staten Island University Hospital. During the second year of residency she was selected as chief resident and was the recipient of the Arthur Puglisi award for exemplifying leadership qualities, providing quality patient care and showing a desire to further oneself professionally.

Dr. Kleiman is a member of the American Dental Association and the New York State Dental Association. She is committed to continuing education courses in order to bring the latest techniques and technologies to her patients.

Dr. Kleiman excels at making her patients feel comfortable and at ease with her friendly demeanor. She aims to change any unpleasant past experiences to pleasant ones and make a trip to the dentist as relaxing as possible.

In her leisure time, Dr. Kleiman enjoys bike riding, traveling, cooking and jewelry making.

Olga Sobol, DDS

General Dentist

Dr.Olga Sobol initially was a Doctor of Psychology in Russia, and then received her Doctor of Dental Surgery degree at New York University College of Dentistry. She considers being able to overcome obstacles to be her greatest accomplishment, and she attributes her success to her ability to face challenges and make a difference in people’s lives.

Dr. Sobol is currently affiliated with the American Dental Association, American Dental Association for Esthetics and the New York State Dental Association, and she contributes generously to various charitable organizations.

In June 2008, Dr. Sobol was recognized by Cambridge Who’s Who for showing dedication, leadership and excellence in all aspects of dentistry.

On August 2018 Dr. Olga Sobol became a member of AAFE, certified from the American Academy of Facial Esthetics and dedicated to be highest level of education and excellence in the field of total facial esthetics. She had advance training in Botox and facial fillers. Dr. Sobol is providing full mouth restorations and TMD, bruxism, pain management treatment.