Meet the Team


Our practice team at Precision Periodontics and Implant Dentistry is what makes our office stand out. Every team member is a key part of our practice, and their unifying goal is to make every patient feel like the top priority.

Crystal Riley – Practice Liaison

As the practice liaison, Crystal’s job is vital to our doctors and our patients. She is responsible for establishing and maintaining a seamless line of communication with referring practices, facilitating practice growth, and coordinating implant procedures.

Originally from Hurlock, MD, Crystal now lives in Alexandria, VA. She holds an Associate’s Degree in Liberal Arts and Sciences, and is a CDA/Certified Anesthesia Assistant. Crystal says she “accidentally” ended up in the dental field, but loves dentistry as well as the doctors and team she works with every day. “I love building relationships with new referrals and introducing them to our philosophy!”

When she isn’t creating strong bonds between dental offices, Crystal is running 5Ks to support her various causes including breast cancer and autism awareness, or working on her other passion – helping rescue unwanted animals and find them good homes.

Dhanisha Patel – Registered Dental Hygienist

As an RDH, Dhanisha’s tasks at the practice are many. She tirelessly sets up, tears down, and cleans exam and operating rooms, restocks hygienic supplies, reviews and notates charts, schedules hygiene appointments, updates doctors on patient health, updates patients on treatment plans, and sees patients for maintenance appointments.

Originally from Havre De Grace, MD, Dhanisha now lives in Washington, D.C. She holds Bachelor’s Degrees in Biology and Dental Hygiene, and says the best part of her job is getting to know the patients, their families, and their hobbies. “Being in the dental profession gives me the chance to combine two things I love – art and science!”

Dhanisha remembers thinking as a child that dental visits were too long, uncomfortable, and boring. “I’m motivated to make sure our patients never feel that way,” she says. “Everyone on our team is dedicated to ensuring each patient is at ease and comfortable!”

Diana Nguyen – Registered Dental Hygienist

As a Registered Dental Hygienist, Diana assists the doctors with routine periodontal maintenance, safeguarding patients’ gums and helping fight gingivitis and periodontal disease. She says that ending up in the dental field was a surprise even to herself, but that she loves the challenges it brings.

Originally from Alexandria, VA, Diana now lives in Chantilly, VA. She is a Licensed Registered Dental Hygienist who graduated from Howard University, and has been working in the dental industry since 2009. “The best part of my job is the nice patients, and getting to work with my favorite people!”

Diana says most people have the misconception that going to the dentist automatically means an unpleasant experience. “When I was a girl, going to the dentist meant getting a tooth pulled,” she remembers. “People need to know that the dentist’s office can be a nice place!”

Fredy Veru – Dental Assistant

As a dental assistant, Fredy concentrates on using technology to assist the doctors in providing excellent dental care to each patient. “With the technology we have today, we can ensure great oral health and Hollywood smiles!”

Originally from Springfield, VA, Fredy spent some time in Tampa, FL before moving back to familiar territory. Coming from a home with two dentist parents, he spent time working in several practices before deciding to turn the experience into a career. “They always told me to take care of my teeth! Now I get to apply my love of technology and teaching to patient education.”

When not explaining dental tech to patients or assisting the doctors, Fredy can be found anywhere soccer can be played. He supports his brother’s soccer team and dreams of visiting Cambodia someday to explore.

Karen Lue-Maxwell – Dental Assistant

As a dental assistant with 31 years working in the dental field, Karen is responsible for assisting the doctors with surgical procedures and ensuring that the day’s appointments flow smoothly by coordinating patients, hygienists, and doctors.

Originally from Jamaica in the West Indies, Karen moved to the US when she was 14 and has lived most of her adult life in Silver Spring, MD. She holds an Associate’s Degree in Business Administration. She says she originally started in the profession because a job presented itself, but truly began to enjoy her work once she found the right doctor to work under.

When she’s not making sure the workday runs smoothly, Karen can be found relaxing at her weekend beach house or spending time with her college age son, whom she refers to as her biggest achievement. She enjoys watching documentaries and would like to someday visit the Holy Land and travel through Africa with her sister and niece.

Kim Filer – Registered Dental Hygienist

As a Registered Dental Hygienist who fondly remembers the “goodie box” at the end of childhood dental visits, Kim handles all aspects of patients’ dental visits – from documenting procedures and updating medical charts to performing periodontal debridement, fluoride treatments, and exposes x-rays. She also educates patients, recommends appropriate dental care and products, and provide dietary counseling.

A native-born Marylander, Kim is a graduate of University of Maryland School of Dentistry with a Bachelor’s Degree in Science; she is a Registered Dental Hygienist. She says she wanted to help people medically and relate to patients in a gentle environment. “Dentistry was an amazing fit – I love knowing we are providing patients with such high-quality care!”

When she’s not maintaining patients’ oral health, Kim spends time volunteering with Hope for Tomorrow, an organization that holds health fairs and free dental clinics. Her idea of a perfect weekend is a leisurely homemade breakfast before heading out for a hike in Gunpowder State Park with her dog and husband.

Kimberly Stapleton – Receptionist

As one of our valued office receptionists, Kimberly answers incoming calls, schedules and confirms appointments, and helps the patient in any way she can. Over 30 years of experience in the industry means she’s handled almost every conceivable dental emergency that could arise.

A Northern Virginia Native, Kimberly currently resides in Fairfax, VA. She volunteered for her local dentist starting in high school, spent two years in college, and achieved her Radiology Certification. She’s stayed up to date in the intervening decades with countless hours spent in dental study clubs, continuing education courses, and lecture halls. “I think patients rarely have any idea of the vast array of treatment options available to them!”

When she’s not making patients feel at home, Kimberly is spending time with her husband, Richard, and the couple’s two Shih Tzus, Bernadette and Gigi. She loves spending time at Mount Vernon, and would like to spend a year traveling the U.S. in an RV with her husband.

Lori Clark – Dental Assistant

For dental assistant Lori, a typical day at the office means setting up and braking down exam and operating rooms, assisting the doctors with surgery, and providing support to patients throughout their visit. She also helps ensure the practice stays compliant with OSHA, CDC, and ADA guidelines.

A transplant from the West Coast, Lori was born in Napa Valley, raised in San Diego, CA, and now lives in Alexandria, VA. She decided to go into the dental profession after working in one from the age of 15 as a part time school year and full time summer job. “I had the most rewarding job of all of my friends – and I still love it, after 30 years.”

Lori remembers being a kid at the dentist and being given candy – yes, candy! – as a reward for good behavior. She says if she could change one thing about the dental industry, it would be the assumption of patients who are afraid of the dentist. “It doesn’t have to be that way, if the patient / doctor relationship is built on trust!”

Mary Mothersole – Treatment Coordinator

As treatment coordinator, Mary is responsible for patient and treatment management, communications with referring doctors/offices, overseeing finances, bookkeeping, OSHA/HIPAA compliance, office administration, and insurance claim filing.

Born overseas, Mary grew up in Berwyn Heights and now lives in Bethesda, MD. She spent two years in college for Dental Assisting (during which time she worked in an orthodontics office), followed by a year in a general practice, 8 years in an endodontic practice, and 30 years in periodontics. She holds a Dental Assistant Radiology Certificate in Maryland, and a Dental Assisting Certificate in D.C.

When she’s not completing her duties with professional diligence, Mary enjoys spending time with friends – either in the mountains, hiking through nature or hot air ballooning; or antiquing through nearby towns. She dreams of travelling the world with her sisters and nieces.

Phi Tran – Dental Assistant

Dental assistant Phi is responsible for many tasks on a daily basis, including sterilizing instruments and setting up trays, preparing patients, assisting the doctors during dental procedures, recording data in patient records, and assisting in dental emergencies.

An Alexandria, VA native, Phi graduated with a Bachelor’s Degree and found a career in the dental field to be a good fit. “I’m adaptable and empathetic, and that makes it easy for me to interact with patients from all different backgrounds!”

When she’s not helping patients on their journey to a beautiful smile, Phi can be found out of doors hiking or at the beach, or indoors playing billiards or bowling. She hopes someday to travel Europe and Asia, volunteering in third world countries to help the less fortunate.

Rachel Young – Registered Dental Hygienist / Hygiene Continuing Education Coordinator

As a Registered Dental Hygienist, Rachel works with patients to provide periodontal maintenance, oral cancer screenings, radiograph evaluations, and evaluations for implants. As the practice’s hygiene continuing education coordinator, she also oversees patient education for better periodontal care.

Originally from Florida, Rachel now lives in Alexandria, VA. She started in the dental profession in 2007 as a dental assistant, then earned her license as a registered dental hygienist four years later. “I have a passion for my profession!”

Rachel says she enjoys being challenged by complex cases, and that her goal for patients is to improve their oral health and way of life. When she’s not leading the charge against gum disease, Rachel can be found working with homeless veterans or participating in Give Kids A Smile.

Rebekah DiMaria – Treatment Coordinator

For treatment coordinator Rebekah, each day brings welcome challenges. She schedules new patients and coordinates with general practitioners for patient treatment, presents treatment plans to patients, assists patients with financing, posts insurance payments, and helps at the front desk as needed.

Raised in Northern Virginia, Rebekah grew up around the dental industry and started working in a friend of the family’s practice at age fifteen. She trained in house and now, 21 years later, continues her education with regular seminars. “I love interfacing with people, and walking new patients through each step of their treatment process!”

When she’s not explaining dental coverage and coordinating treatment for patients, Rebekah is spending time with her husband, daughter, and the family Doberman. She enjoys the Shenandoah and travel, and contributes to Feeding America on a monthly basis.

Sara Bernhardt – Personal Assistant

As Dr. Zalewsky’s personal assistant, Sara says her job description is simple – keep the doctor’s stress levels down so he can focus on providing exceptional patient care. She plans his schedules, books his meetings and events, and keeps him on task. “I get to boss the boss around!”

Sara grew up in Stillwater, OK, and currently lives in Alexandria, VA. With a Bachelor’s Degree in Science in Human Development and Family Sciences, Sara enjoys working with the team at Precision Periodontics. “I’m one of those people who loved the dentist as a child, even when I had to have teeth pulled or braces adjusted.”

When she’s not keeping an eye on Dr. Zalewsky’s schedule and coordinating his day, Sara enjoys her weekly “dose of country” – she line dances and two-steps at a local bar on Fridays – and also enjoys turning weekends into “mini-adventures” to try new foods, places, and experiences. She has a huge bucket list including Barrier Reef diving and travelling overseas.