Office Staff Members

Our exceptionally capable and friendly staff members are our greatest assets. They are excited about what they do, have high standards of quality and integrity, and are motivated to achieve the best results for our family of patients. Our dental hygienist and assistants are licensed professionals with many hours of training.

We pride ourselves on staying on the cutting edge of dentistry and patient communication. Feedback from our patients about an experience in our office is always welcomed. Our highly trained, dedicated and motivated staff has one primary goal — your utmost comfort! Every member of our staff is able to answer your questions regarding the latest in dental care.

Dental Hygienist

Gwen Duong, RDH

Gwen has been our Registered Dental Hygienist since 1997. She received a Bachelor of Science degree in biology from Virginia Commonwealth University in 1993 and a Bachelor of Science degree in dental hygiene in 1997. She focuses on two major health issues: your home care techniques and your dental fitness. Ms. Duong provides the knowledge and techniques necessary for you to maintain good oral health for a lifetime. Both our adult and child patients appreciate Gwen’s gentle and caring manner. They are comfortable under her care and therefore keep their oral hygiene care up to date. Gwen and her husband, Steve, live in Centreville, Virginia, and enjoy spending time with their son and two daughters: Cameron, Camille and Caeley.


Jill Tsiamis, RDH

Jill graduated from Oakton HS and went on to continue her bachelor’s in marketing from GMU. She completed her hygiene training from the University of MD in 1994 and worked until 2006, including part-time with Dr. LeBeau while Gwen was on maternity leave. She stayed home to raise her three children Yianni, Nikolas and Eleni, and during that time became an avid tennis player, certified personal trainer, and fitness nutrition specialist. Once her kids were in high school and college, she returned to dental hygiene and works part-time as a licensed realtor. She enjoys biking, hiking, trips to the beach, spending time with family and friends, attending concerts, and vacationing in Florida and Maine. Jill loves meeting new people and can’t wait to build relationships and care for our patients.


Dental Assistants

Our dental assistants utilize state-of-the-art dental assisting techniques. Their training allows them to render the highest standard of care during your office visits.

Nevenka Poberaj

Nevenka joined our practice in 1988 and is a most technically gifted assistant. She is very proficient in handling our highly computerized dentistry practice and understands the most detailed dental materials. She is constantly working to improve the patient experience. Originally from Solkan, Slovenia, Ms. Poberaj lives in Bethesda, Maryland with her husband, Silvan.


Demi Duong

Demi initially joined our practice in 1998 as a front desk/office manager. She excelled in this role for 17 years until the birth of her twins, Ethan and Emmie, in 2006. After a brief role as a stay-at-home mom, Demi came back to work as part-time dental assistant. She enjoys family time and keeping in shape. Ms. Duong lives with her husband, Kenny, and the twins in South Riding, Virginia.


Front Desk/Office Manager

Donna Roller

Donna is the most recent addition to our staff, having joined the team in 2012 as a front desk/office manager. She received her Bachelor of Science degree, with distinction, in applied mathematics from the School of Engineering and Applied Science at the University of Virginia. Upon graduation, Ms. Roller began her career as a programmer/business analyst for Control Data Corporation, and then worked as a business analyst for GTE Telenet before becoming a stay-at-home mom for her two children. As her children progressed through high school, she and her husband opened a custom picture-framing business in Fairfax, Virginia, where she enjoyed working with customers, helping with the framing, and learning the details of setting up and running a small business.

Donna enjoys meeting and working with the patients in our practice. She makes every effort to ensure that patients have the best experience possible in every aspect of their dental needs, including scheduling, answering questions, coordinating with other dental offices, and handling finances and insurance issues. She is happy to assist with any request. After hours, Donna’s interests include family outings, photography, hiking and kayaking. She and her husband live in Reston, Virginia.


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