Our team members are always warm, friendly and treat everyone like family. We understand how going to see the dentist can be harrowing for some and want to make your visit with Dr. Nikolas Stathopoulos as positive as possible. If there is anything we can do for you, do not hesitate to call us at 925-718-8483. We invite you to schedule your visit with our dentist in San Ramon, California, at Parthenon Dental today.


Chad Bergquist
Office Manager
Chad came to Parthenon Dental with over 13 years of dental experience. Chad has a bachelor’s degree in Economics from Sacramento State and a master’s degree in Healthcare Administration from Saint Joseph’s University in Pennsylvania. He is married and has two kids and two dogs. He enjoys BBQing, traveling, the 49ers and learning new things. Fun fact, Chad is a bowling amateur and can bowl a 220.
Jane Pham
Assistant Manager
With nearly 20 years of experience in dentistry, Jane brings a wealth of knowledge and compassion to her role as assistant manager at Parthenon Dental. Her dedication to patient care is evident in every interaction — she ensures each patient feels welcome, heard and comfortable from the moment they walk through the door. Jane’s extensive understanding of dental treatments and procedures allows her to confidently answer questions and guide patients through their care with clarity and warmth.
Outside of the office, Jane embraces life with enthusiasm and joy. She loves long road trips, great food, and spending time with her grandchild. Whether she’s jet skiing, soaking up the sun in Hawaii or enjoying any outdoor activity that keeps her moving, Jane’s energy and love for life are contagious. Her professionalism, positivity and genuine care make her an invaluable part of the Parthenon Dental team.

Voula Stathopoulos
Chief Financial Officer
Voula is the financial mastermind behind the curtain who has a keen eye for detail and financial planning. She enjoys her family of two boys and one girl, and of course, Dr. Niko. She loves her vacation time in Greece with her family, exercising and hiking with friends. She enjoys hosting and cooking for
parties. She loves In-and-Out Burger occasionally and traveling to small towns around California.
Roxanne Campbell
Scheduling Coordinator
Roxanne is the friendly voice and smiling face that helps keep Parthenon Dental running smoothly every day. With many years of experience in the dental field, Roxanne brings extensive knowledge in scheduling, insurance coordination, and patient record management. Her professionalism and attention to detail ensure that every patient experience is seamless from start to finish.
Beyond her expertise in dentistry, Roxanne finds joy in her wonderful family — especially her children and grandchildren, who are her pride and joy. In her free time, she enjoys listening to music, relaxing at home with her loved ones and appreciating her husband’s singing and delicious cooking. Roxanne’s warmth, dedication and caring spirit make her an invaluable part of the Parthenon Dental family.

Claudia Wardrip
Expanded Functions Dental Assistant
Claudia has been a Registered Dental Assistant with extended functions for over 38 years. She started working with Dr. Niko in 2019 and has vowed to stay with him until she retires. She has three daughters, one granddaughter and a wonderful husband. In her free time, she enjoys watching the Golden State Warriors, cooking, running (including half marathons), hiking, dancing or watching depressing movies based on true stories.

Alexis Ramirez
Dental Assistant
Alexis loves all things dental. She is new to the dental field having earned her certification in dental assisting in 2023. She loves to learn, especially when it comes to the new dental technology. Alexis loves to be the first to know about what dental technology is coming out, what features they have and how they can help our patients. She loves to cook her grandma’s recipes and spending time with her three cats. Alexis also enjoys playing games in the computer or her Nintendo Switch.

Yadira Zelaya
Registered Dental Assistant
Yadi has worked in the dental field for over 20 years. As a registered dental assistant, she loves taking care of her patients and making them feel at home. She loves to travel, spending time with her family (including her two cats) as well as hiking, long road trips and reading a great book.

Asia Baharistani
Dental Hygienist
As a registered dental hygienist, Asia enjoys speaking to her patients about gum health. She loves being an advocate for patient oral health and claims she is “the fastest prober in the west”. She loves spending time with her huge family, her pet cat, Moosh, anything beauty care related and movies from the 80’s. She enjoys cooking, exercising when she has time and her competitions as a billiard amateur.

Bessie Tuazon
Dental Hygienist
Bessie is well seasoned in dental hygiene and passionate about dentistry. She has a wealth of knowledge about oral health and its effects on our overall health. Her patients love her genuine concern for them, which is why she has a very loyal patient base. Bessie enjoys her animals, pickle ball, biking, hiking and rock climbing. She loves to travel with her family of three children and husband of over 33 years.