Mark R. Maher, DDS
Walnut Creek, CA

Our Team

Mark R. Maher, DDS

Our vision is to provide each patient with a personal, supportive, and compassionate dental experience. We focus on the specific oral health needs of each patient for the long term with keen attention to their overall health and lifestyle and a strong emphasis on prevention and education. We are devoted to providing ultimate care in a technologically advanced setting.

Meet Our Team

Mark R. Maher DDS

Dr. Mark Maher, DDS | Walnut Creek, CA

Dr. Maher, to borrow from the John le Carré novel, is a Tinker Dentist Soldier Guy – a man of many talents and interests.

Tinker: He holds a Bachelor of Science in Mechanical Engineering from Brigham Young University where he studied composite materials, computer aided design and manufacture (CAD/CAM), mechatronics, and fluid mechanics.

Dentist: From BYU, Dr. Maher returned to his native California to pursue his DDS degree from the prestigious University of the Pacific School of Dentistry in San Francisco. He is a certified Cerec® (“same day” crowns) and Invisalign® (“invisible” orthodontia) provider.

Soldier: Having completed his formal dentistry training, Dr. Maher began his Dentistry Residency with the U.S. Army at Ft. Benning, Georgia, where he was awarded a one-on-one mentorship with distinguished specialists in oral surgery, periodontics, prosthodontics, orthodontics, endodontics, pediatric dentistry, and general restorative dentistry. While at Ft. Benning, Dr. Maher was certified in Airborne School where he learned to jump out of airplanes before he and his family were transferred to Hawaii.

Dr. Maher shipped out of Schofield Barracks in Hawaii to Iraq for Operation Iraqi Freedom where he served as Brigade Dental Surgeon from August 2006-2007. In Iraq, Dr. Maher was the sole provider of comprehensive dental care for over 5,000 U.S. coalition service personnel and civilians.

Guy: He is fluent in French and enjoys skiing, cycling, spending time with his family, and tinkering with cars.

Through a combination of state-of-the-art technology, sensible treatment plans, and genuine devotion to the unique needs of each patient, Dr. Maher preserves healthy teeth and gums, alleviates oral discomfort, and improves the appearance of smiles on a daily basis. He has applied his unique blend of artistic and technical skills to produce durable and aesthetic results in hundreds of happy patients. A young dentist with a grasp of the most innovative, minimally invasive new procedures, Dr. Maher is dedicated to lifelong learning through continuing education courses.

Dr. Maher is licensed by the Dental Board of California and is a member of the American Dental Association, American Academy of Cosmetic Dentistry, and California Dental Association.

Nazia Khan Office Manager


Naz started off in the dental field as a Registered Dental  Assistant in 2006. After years of working chairside, she realized her passion of working at the front desk providing personalized care and helping  to facilitate a patient’s office experience. She joined Dr. Maher’s office in 2018 as his treatment coordinator.  

In her spare time, Naz likes to spend time with her husband and their  1 year old son, Matthew. She also enjoys watching movies hanging out with family and friends.

Ellen Gilland Hygiene Administrator

Ellen has worked in Dentistry as an Office Manager and Hygiene Administrator for more than 25 years. She is a Native Californian and was born and raised in the Bay Area. In her personal time, she, her husband Tom and their dog Duke enjoy spending time with family and friends. They enjoy camping and vacationing at their cabin in King’s Canyon. What Ellen enjoys most about her role is the interaction with our wonderful patients. She is dedicated to providing an exceptional experience for every patient and having a great team atmosphere. 

Janai Romero Patient Coordinator

Janai started working with Dr. Maher as an intern in late 2019 and upon completion of her internship, joined Dr. Maher's team permanently as an RDA. In March 2022, Janai took on the new role of Patient Coordinator. What Janai enjoys most about her job is being able to provide patient's with exceptional quality of care. When Janai isn't working she enjoys spending her free time with her husband, going on road trips and hikes with their two dogs, cooking and trying new foods, and spending time with her family.

Jessica Lopez Registered Dental Hygienist in Extended Functions

Jessica is excited to be your dental hygienist!  She started her career as a dental assistant and soon after discovered her passion for dental hygiene. She has worked in the the dental field for over 20 years and for Dr. Maher since 2014. You will find that Jessica is compassionate and able to put her patients at ease. Her goal is to make sure all of her patients feel comfortable and leave her chair with a smile.

Jessica and her husband have 2 amazing daughters, 3 cats, and 2 dogs. Their favorite place to vacation is Maui.

She hopes to see you soon!


Susan Griffin Registered Dental Hygienist

Susan has practiced dental hygiene in California for more than 35 years. Her undergraduate education began at St. Mary's College in Moraga, California.  She later obtained her dental hygiene degree from Loyola University in Maywood, Illinois. She has served on the Dental Hygiene Board of California as an examiner and  has held many offices for the Mt. Diablo Dental Hygiene society including Vice President. She currently resides in Walnut Creek with her husband and enjoys spending time with her two daughters, family, and friends. She is happy to be part of Dr. Mark Maher's fantastic team for the past year. 

Marty Osborn Registered Dental Hygienist

Marty has practiced dental hygiene for over 30 years and joined Dr. Maher's team when Dr. Skiba retired. Marty loves the art and science of dentistry, working with her hands and helping people attain healthy smiles. Marty lives in Danville with her husband, Jerry and their black lab, Sammy. Flowers, the arts, swimming, dogs, movies, beaches, travel and people are some of her favorite things.

Sergio Montoya III Registered Dental Hygienist

Sergio is a Registered Dental Hygienist and a graduate of Sacramento City College of Dental Hygiene. He believes every patient is different and should receive the highest quality of care. As his patient, you can expect to be treated with kindness, compassion and thoroughness, along with some good laughs. He enjoys connecting with his patients and educating them about their oral health.

He enjoys spending his spare time with family and friends. He loves to BBQ, eat good food and participate in outdoor activities.

Danny Cesca Registered Dental Assistant

Danny has been with Dr. Maher for 10 years and in the dental field for 17 years. He currently helps Dr. Maher as a Registered Dental Assistant. If he is not assisting the Doctors, he is found in the front office helping provide the best experience possible for our patients.
He is at the office part time due to his pursuit of obtaining a Bachelor Degree at Cal State East Bay in Hayward. Upon graduation he plans to apply to dental school and become a general dentist. Wishing to go to the University of the Pacific Authur A. Dugoni School of Dentistry, the same school that Dr. Maher graduated from. It has been a dream since childhood to become a dentist and with each semester completed he is one step closer to achieving this goal. When he is not working or studying he is going on a day or weekend road trip or walking his dog. Disneyland is one of his favorite places to go and vacations there at least once a year. His other passion is helping patients change their perspective of dentistry.  He wants to provide the best dental experience possible where patients no longer dread coming to our dental office or have fear of the dental procedures.

Sandra Poljakovic Registered Dental Assistant

Michelle Pimentel Registered Dental Assistant

Michelle has been working in the Bay Area as a Registered Dental Assistant for the last 11 years. She loves the artistic side of dentistry like fabricating temporary/permanent crowns. She enjoys building relationships with the patients and helping them feel at ease while in our care.

In her free time, Michelle enjoys spending time with her nieces and nephews, taking road trips with her husband and their dog Benny.

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