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The Exchange Dental Group


Dedicated Staff

L. Portugeys, DDS


Dr. Portugeys graduated from New York University Dental School in 2002. He is a member of the American Association of Endodontists.

He completed general dental practice residency at Stony Brook University, and post graduate endodontic (root canal specialist) residency in the NYU Endodontic Program.

He is a warm and caring endodontist who always strives to make his patients as comfortable as possible. He uses a special microscope that magnifies up to 20 times, which allows him to be as finite as possible. In his spare time he enjoys spending time with his two children, swimming, ice skating and hockey.

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.

Joseph Song, DDS, MMSc

Periodontist and Dental Implant Specialist

Dr. Joseph Song is a board certified periodontist and dental implant specialist. He is also one of the few dentists in the U.S. to be fully certified in LANAP®, a highly effective laser therapy for the treatment of periodontal disease.

Dr. Song graduated from Columbia University College of Dental Medicine in New York. He went on to complete a three year full-time residency in periodontics and implantology at the Harvard University College of Dental Medicine and received a certificate in periodontics and Master of Medical Science in Oral Biology. He strongly believes in continuing education, is an instructor of Euro Dental Implant Company and is actively involved in teaching implant dentistry, nationally and internationally. He specializes in dental implants, gum surgery, as well as wide range of other treatments.

Dr. Song is an active member of the American Dental Association, New York State Dental Association, International Congress of Oral Implantologists, American Academy of Periodontology, and the American Board of Periodontology. While he aims to provide the highest quality of care in a compassionate and comfortable manner, his state of the art office allows a pleasant experience for patient and his warm, easy going manner allows for maximum communication between doctor and patient.

Robert Weeman, DDS


Dr. Robert Weeman received his Doctor of Dental Surgery degree from New York University College of Dentistry and received his certification in orthodontics shortly thereafter. He has been a practicing orthodontist for nearly three decades. During that time, he has taken numerous continuing education courses to ensure he always has knowledge of new, innovative orthodontic procedures.

Dr. Weeman is experienced in treating a wide variety of patients – children, adults, orthagnatic surgery patients, and even other dental professionals.

Among his professional memberships are the American Dental Association, American Association of Orthodontics, American Lingual Orthodontic Association, Northeastern Society of Orthodontics, and the New York Dental Forum.

In his personal time, Dr. Weeman enjoys snowboarding, clay shooting, and sculpting. He is also a car enthusiast, but has a special fondness for Porsches.

Jo Biermann, RDH

Jo is a staple and true veteran of The Exchange Dental Group, having been faithfully employed at the practice since 1984. When she isn’t applying her soothing touch as a dental hygienist, she enjoys spending time with her husband and son, reading, dancing Zumba, traveling and the occasional Harley ride.

Mary Ann Liew, RDH

Mary Ann joined the practice in 2006 and has over 10 years’ experience as a dental hygienist, completing her training at New York City College of Technology. Her hobbies used to include tennis, gardening and swimming, but now her time outside of work is devoted to raising her two adorable daughters with her loving husband.

Raquel Lim, RDH

Raquel joined The Exchange Dental Group in 2011 upon graduating from New York City College of Technology. She is a native of the Philippines and when she isn’t working, she enjoys taking road trips with her husband and two sons, gardening and playing the piano.

Gabrielle James, RDH

Gabrielle was born and raised in New Zealand. She trained at the New York City College of Technology after moving to New York with her husband in 2007.

When she isn’t working, she enjoys spending time with her family, traveling the world, cooking and hiking with her dog Jet.

Mary Jean Broxmeyer, RDH

Mary Jean starting working at The Exchange Dental Group in 1997 as a dental assistant. During this time, she went to school while working part-time to pursue a career as a dental hygienist at Hostos Community College. She was born and raised in the Philippines and has a 15 year old daughter who is a sophomore in high school and a husband who she’s been happily married to for 19 years.

When she is not working, she enjoy crocheting, hanging out with her daughter, and listening to music.