Meet the Napa, CA Dental Team

Our Napa dentists have a great team to help provide you with the best dental care possible. We love getting to know our patients and make your comfort in our office a top priority, so please, read below to get to know us!


Administrative Team



Appointment Coordinator

Born and raised in Napa, Herminia began her dental career in 1996. She has the amazing ability to speak two languages, Spanish and English. She enjoys most about dentistry are the positive connections she makes with patients. She serves as a patient advocate, helping them along the way to ensure they understand their dental needs. In addition to her dental experience, she is a CNA, Certified Nurse Assistant. Herminia has many passions including her church and helping the elderly. When asked what she would do if given $1 million dollars she said: "help children in need." And who would guess, her least favorite food is a hamburger! 



Treatment & Financial Coordinator



Dental Hygiene Team

kathy kostka


Registered Dental Hygienist

Kathy worked for many years as a dental assistant before attending dental hygiene school.  She graduated from Diablo Valley College in 2000 and has enjoyed working with Dr. Claus ever since.  She has learned a great deal from Dr. Claus and strives to learn more through continuing education courses.  Kathy loves her job, especially getting to know her patients, educating them, and learning from them as well.  Kathy has been married to her wonderful husband, Joe, for 35 years.  They have a beautiful daughter, Jennifer, an adorable dog, Hannah, and a crazy cat named Kiki who has used eight of her nine lives already.



Registered Dental Hygienist

Sheryl has been in the dental field since 2005. She loves dentistry because she looks forward to connecting with patients while providing comfortable and through dental care. In her free time, she enjoys hanging out with her family and friends, trying out restaurants, and taking short trips. She also likes rooting for bay area sports teams.


Registered Dental Hygienist

Katie's favorite part of dentistry is getting to work with Dr. Claus to keep patients happy and healthy. Katie likes to keep the mood light yet professional to help patients feel confortable during their cleanings at the office. She graduated from Carrington College in Sacramento with Honors. Katie enjoys spending time with her two children outdoors, and getting together with friends and enjoying the resturants of the valley. She looks foward to getting to know the patients and taking care of their dental needs.

Dental Assisting Team



Registered Dental Assistant

Lissette is quiet and sort of shy but very sweet and talented. She is bilingual which is very helpful (Spanish and English). She began working with Dr. Claus at the completion of her dental assisting education, October 2011. She works alongside Dr. Claus during most procedures where she ensures that each patient leaves satisfied with their dental experience. Lissette really likes getting to know each patient, hearing their stories, and seeing them proud of their improved dental health. When she is not at work, Lissette spends time with family and friends and loves exploring the outdoors with her son. She brings the best lunches to work, we always want to eat what she's eating!



Registered Dental Assistant

Madonna's family moved from Southern California, the inland empire area, to Napa and they are so excited to be part of the Napa community. Her curiosity for dental assisting started when she went through orthodontia in her early twenties. Watching the assistants perform their duties with confidence made her want to go to dental assisting school. Madonna became a dental assistant in 1995. She was very fortunate to find Dr. Claus' office and be part of a great team because of the quality and patient care the team gives to the patients. A fun fact about Madonna is that her mom taught her how to cook at age 6 and to this day she enjoys cooking for her family and friends.  She has been married for 31 years. Her lovely daughter who keeps her busy with piano and violin lessons. She will be starting at Vintage High School and will be taking band, marching band, and strings. 


Learn more about us by checking out what sets our Napa dental practice apart