Meet the Doctors

Dr. Mark D. Geller – Administrative Director

Mark GellerAs the Administrative Director for The Geller Dental Group, Dr. Mark Geller consults one-on-one with patients to develop individualized treatment plans to meet their needs. Additionally, he oversees day-to-day operations, coordinates the efforts of the professional staff and collaborates with Dr. Randy Geller, his son and partner, to help the practice reach its goals.

Dr. Geller built the practice from the ground up, and continues to steer its future. His decades of experience inspired him to create a patient-friendly layout for the practice’s new state-of-the facility. Knowing that relaxed patients are happy patients, he designed the treatment rooms to allow patients to gaze out onto the courtyard gardens. This serenity keeps patients at ease, and demonstrates a key principle of the Geller philosophy – complete dental care, for mind and body.

Another aspect of comprehensive dental care is the bringing together of multiple specialists and general practitioners under one roof. This desire to serve patients more fully was a driving force behind Dr. Geller’s creation of the new facility and the merger with the Merrick dental practice of Drs. Roger Pflugfelder and Arthur Stanton.

Dr. Geller graduated from New York University College of Dentistry after completing his undergraduate work at SUNY Buffalo. He’s a member of the American Dental Association, American Heart Association, Bellmore Chamber of Commerce, Bellmore Study Group, New York State Dental Association, Nassau County Dental Society and the US Speed Skating Association. Dr. Geller, his family and the practice passionately support many charities and disaster relief efforts through generous donations.

Dr. Geller’s wife, Lee, has served as the practice’s Financial Manager for 25 years. They are both lifelong residents of Bellmore, raising their two sons, Randy Geller, D.D.S., and Brad Geller, M.D., here. Randy is married to Dana Geller, D.P.T., a physical therapist, and Brad, an ophthalmologist, is married to Debora Geller, M.D., an allergy and asthma specialist.

Dr. Mark Geller maintains an active lifestyle boating, skiing, scuba diving, and playing basketball. He continues to incorporate speed skating into his exercise routine, a sport he competed in during his youth, ranking as a National Champion.

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Dr. Randy R. Geller – Director of Dentistry

Randy GellerDr. Randy Geller, the Director of Dentistry at The Geller Dental Group, has developed expertise in cosmetic and implant dentistry through continual professional development and a passion for serving patients. He’s driven by three key principles: helping patients feel and look their best, offering the latest care options and guiding the Geller Dental Group’s professional staff to be among the best in the country.

Dr. Geller has set new standards of care by studying with the industry’s foremost experts, and bringing cutting-edge technology to the practice. With each new technique mastered, he educates The Geller Dental team, ensuring every patient receives the highest level of care available.

Cosmetic and implant dentistry has made huge strides in recent years, with Dr. Geller embracing each innovation as it becomes available. He was personally mentored by Dr. Larry Rosenthal, a world-renowned pioneer in cosmetic dentistry at Aesthetic Advantage Hands On Aesthetic Continuum.

Furthermore, he’s performed comprehensive study at the Nobel BioCare Training Institute, where a breakthrough technique for surgical and prosthetic implant rehabilitation has been developed. This procedure, Teeth-In-An-Hour™, has revolutionized implant dentistry, and could eliminate dentures and bridgework for countless patients. Dr. Geller chose to employ this new method because it offers patients a beautiful, healthy smile without compromise. Discomfort and recovery time are minimized, and the results are breathtaking.

He also performs the latest minimally invasive techniques. These include digital root canal and laser dentistry. This provides comfortable alternatives to patients who require treatment a step above routine dentistry.

Dr. Geller graduated with honors in Prostodontics and awards in Occlusion from the prestigious New York University College of Dentistry. He maintains many professional memberships, including the American Academy of Cosmetic Dentistry, American Academy of Implant Dentistry, American Dental Association, New York State Dental Association, the Nassau County Dental Society and the Bellmore Study Group.

A lifelong resident of Bellmore, Dr. Geller worked as a lifeguard at Jones Beach and served as a member of the Bellmore-Merrick Volunteer Ambulance Company. In 1996 he earned his Bachelor’s Degree in biology from the University of Colorado at Boulder. Today, he lives in Southampton with his wife and two children. Outside the office, he keeps his mind and body fit through skiing, surfing, scuba diving, boating, and cycling.

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Dr. Kevin Nguyen – General Dentist

Dr. Nguyen graduated from NYU College of Dentistry with a degree in Doctor of Dental Surgery. He did additional post graduate training through General practice Residency at Northshore-Long Island Jewish Hospital system. Dr. Nguyen was intensively trained in all aspects of dentistry.
When he is not working, he takes his daughter and wife out for family time. His hobbies are traveling, playing tennis, etc
Dr. Nguyen believes that he can restore and improve his patients’ confidence and quality of life. Also, he loves interacting and educating patients about prevention of oral diseases. These are the main things that make Dr. Nguyen love dentistry.


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Dr. Jaime M. Poulos – Prosthetic’s and General Dentistry

Dr. Poulos was born and raised in Northport. He went on to attend New York University as part of their 7 year B.A. /DDS program. Upon completion of his 4 year DDS degree, he was elected into the Omega chapter of OKU (Dental Honor Society). After graduation Dr. Poulos elected to pursue a specialty certificate in Prosthodontics, which is the specialty dedicated to the restoration of complex cases involving crowns, bridges and dentures. Dr. Poulos attended the University of Illinois Advanced Prosthodontics program in Chicago, IL for 3 years. Dr. Poulos returned to Long Island with his wife and daughter after completing his specialty program which is the specialty dedicated to restoration of complex cases involving crowns, bridges, and dentures.

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Dr. Anna Kwasnik – General Dentist

Dr Anna Kwasnik is a passionate, gentle and caring dentist, with over 15 years of experience in various areas of dental profession, trained in Europe and the United States. Upon graduation as Doctor Of Dental Surgery from New York University, Dr Kwasnik was
inducted to the prestigious National Dental Honor Society­OKU. She also holds Fellowship status in International Congress Of Oral Implantologists (ICOI) and Academy Of General Dentistry (AGD). Well grounded in traditional dental medicine and surgery, Dr Kwasnik is committed to stay up to date with latest trends and technology and provide the highest quality of care to her patients. Her extensive education and top notch clinical skills combined with a very helpful and down to earth attitude continue to award her high respect and recommendations from both patients and colleagues.

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Dr. Diana Gabriel – Pediatric and Adolescent Dentist (Board Certified)

Diana GabrielDr. Diana Gabriel joined The Geller Group in 2008 as the Pediatric Dental Specialist. This is a vital role within the practice, preparing young patients for a lifetime of good dental habits. Dr. Gabriel approaches this goal in two ways: by helping children develop solid home care habits for a healthy smile and making each dental experience a positive one through patience, compassionate chairside manner and modern dental techniques, such as digital radiology. The more at ease patients feel about coming in, the more proactive they may be in practicing good hygiene. This makes it possible for her to focus on prevention and education, rather than the less pleasant aspects of a visit, such as “drilling and filling.”

As a mother and caring clinician, Dr. Gabriel knows full well the challenges and rewards of working with patients in their teen and pre-teen years. It’s invigorating, fulfilling work that brings a smile to her face each day.

Her success in our office comes as no surprise, as she demonstrated a keen passion throughout her education. She earned her Bachelor’s Degree from New York University. Later, she graduated from the university’s College of Dentistry in 2005 where she ranked at the top of her class and was a member of the Dental Honor Society. Dr. Gabriel continued to hone her work ethic during her postgraduate residency at North Shore Hospital in Manhasset. She gained specialized training in pediatric dentistry at Jacobi Medical Center.

Dr. Gabriel stays at the leading edge of modern dentistry through memberships in professional groups such as the American Dental Association, the New York Dental Society, the Nassau County Dental Society and the American Academy of Pediatric Dentistry. Dr. Gabriel is a Diplomate of The American Board of Pediatric Dentistry

She, her husband and their children live in the community where they enjoy spending time together.

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Dr. Todd M. Mayer – Periodontist

Todd MayerDr. Todd Mayer has been in practice since 1997, recently joining The Geller Dental Group. As all dentists do, he takes satisfaction in helping patients improve their oral health. And as a periodontist, Dr. Mayer truly appreciates the opportunity his specialty offers to combine the intellectual aspect of the science with the practical application of modern dentistry. He is a published researcher as well as an experienced practitioner.

His research, which centered on a clinical trial of dental implants, appeared in the Journal of Periodontology. His training covers all aspects of periodontics and implant dentistry, including osseous surgery, regenerative surgery (bone grafting), mucogingival procedures (gum grafts) and nonsurgical procedures.

Always keeping his patients’ best interests in mind, Dr. Mayer is proud to be part of The Geller Dental Group, a practice that emphasizes easy access to multiple practitioners and specialists. He believes this design creates improved communication between a patient’s doctors, enhancing not only convenience, but quality of care for diverse dental needs.

Dr. Mayer graduated with a Doctor of Dental Surgery degree from the University of Buffalo in 1997. He went on to receive his certificate in periodontics by completing the Baltimore College of Dental Surgery’s advanced specialty education program.

He was born and raised on Long Island, and currently lives in Commack, where he and his wife are raising their son and daughter.

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Dr. Joshua Wolf – Oral & Maxillofacial Surgeon, TMJ Treatment

Josh Wolf      Dr. Wolf is a native of Long Island and received his Doctorate of Dental Surgery degree from the Columbia University College of Dental Medicine. Upon graduating, he continued his training at The New York Hospital of Queens, completing a General Practice Residency where he received advanced training in all areas of dentistry.

With an increased interest in Oral and Maxillofacial Surgery, Dr. Wolf pursued further training at the Brooklyn Hospital Center Oral and Maxillofacial Surgery department. He had the opportunity to rotate through the Brooklyn Veterans Affairs Oral Surgery Department treating patients requiring reconstructive implant surgery working conjunction with multiple other disciplines in fields of medicine and dentistry. Dr. Wolf then spent a year in North Eastern Pennsylavania training in the Geisinger Medical Center where he received training in maxillofacial trauma, pathology, cleft lip and palate, TMJ surgery, and orthognathic surgery using computer generated virtual surgical planning techniques.

Upon completion of his residency Dr. Wolf was appointed as an attending in The Beth Israel Medical Center, The Brooklyn Hospital Center New York Presbyterian of Queens and joined the Geller Dental Group

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