Our Team

Dr. Zak Dental Care has been serving the community of Southern California since 1994.

Here at Dr. Zak Dental Care, we are dedicated to continuously improving and attaining the most efficient and up-to-date technology and techniques for our dental work, and we continue to team up with the most qualified professionals. We believe that it is our task to educate our patients and our community as a whole about proper oral health and effective ways of financing this goal. We continue to provide our patients with effective, all-encompassing, and affordable dental care.

Meet our Team

Our staff is extremely well-trained and skillful, and we are committed to providing enthusiastic and positive service to all our patients. All our team members are registered assistants, and the staff has had many years of experience in providing patients with superior care.

Dr_Ilya_ZakDr. Ilya Zak, D.D.S.

Dr. Ilya Zak attended USC Dental School, graduating in 1990. He was one of only eight unique students to complete the ADAPT program, an accelerated 6-year dental program that allows one to complete both undergraduate and graduate requirements. After graduation, he completed TMJ/Pain Management residency at White Memorial Hospital and became a qualified medical examiner for TMJ dysfunction in California. He is also a part-time clinical instructor at his alma mater, USC Dental School, and he practices in Simi Valley, Valencia, Agoura Hills, and Long Beach since 1994.

Dr.  Howard KopelDr. Howard Kopel, D.D.S.

Dr. Howard Kopel, DDS, attended USC School of Dentistry and has been working in the field for more than 3 decades. He has received excellent training in every dental field, and he has received numerous awards for excellence in oral cancer diagnosis. The Zak Dental Team is honored to have worked with Dr. Kopel for over a decade, and he is in charge of dental diagnosis as a managing doctor in our practice.

Dr. ShirashiDr. Ronald Shiraishi

Dr. Shiraishi was born and raised in California, and attended UCLA for undergrad and Washington University for dental school. He has been working in our Downey office for more than 25 years, and he has treated generations of patients. Dr. Shiraishi has almost 3 decades of experience and is committed to improving his patients’ health. In his free time, he enjoys being outdoors and fishing.

Dr.KarnakovaDr. Olga Karnakova, D.D.S.

Dr. Karnakova graduated from the Moscow Medical Stomatological Institute in 1991. Dr. Karnakova worked for many years in Moscow before moving to the United States where she has worked for over 18 years as a general Dentist and part time instructor for the Duggan Study Institute.
Dr. Olga Karnakova is fluent in English and Russian languages.

Dr. Charles ChungDr. Chang, DDS

Dr. Charles Chung graduated from Loma Linda University’s School of Dentistry in 1999. While there, he went on many volunteer missions in southern California and South America that involved dental work and inner-city volunteering. He worked at several other dental offices before becoming part of our team. He is a member of the American Dental Association and California Dental Association. Dr. Chang has been working with our team for over a decade. His work is always precise and performed calmly, making him very popular with our patients.

Dr.-Nadia Dr. Nadia Abazarnia

 Dr. Nadia is a Graduate of the Carlo Davila University of Bucharest in 1993. She is Fluent in English, Farsi, and Romanian. Dr Nadia has been practicing in California for over 14 years. She brings her wealth of knowledge to our offices.

Dr. William Olson, DDS

Dr. William Olson attended Loma Linda University, graduating in 1987. His entire family is in the medical field which was what made him become a dentist. His passion is doing cosmetic work and seeing his patients smile after the work is done. It brings him a huge satisfaction when he helps patients reach their ultimate goal when it comes to their smile. One fun fact about him is that he likes to go hiking, skiing and loves dogs.

Dr.-Roshi-200x240Dr. Roshi

Dr. Roshanak Momen (Roshi) received her degree in 2016 from Loma Linda University, School of Dentistry. She also got an award for being a Teacher’s Assistant in Restorative Dentistry. She has her DDS degree from Azad University in 2009 as well. Dr. Roshi speaks English and Farsi and is committed to improving his patients’ health.

PaulDr. Paul

Dr. Paul Bayat graduated from USC Dental School. He has his dentist experience in the field for more than 15 years. Dr. Paul has been treatment planning and treating more than 50,000 patients. Dr. Paul has been a managing dentist for many years and has worked together with all dental specialists to improve patients oral health.

dr-vahe-cropDr. Vahe

Dr. Vorporian (Vahe) graduated in 1999 with is DDS degree from Armenia, and has been practicing in California since 2005. He extended his education in cosmetic restoration, endodontics and implant surgery. Dr. Vahe loves his career in Dentisty and his main goal is for his patients to smile with more confidence. He speak English, Arabic and Armenian.

Dr. Armen Galustian, DDS

Dr. Galustian graduated from the Azad Tehran University of Medical Sciences, School of Dentistry, with his D.D.S in 2003. Dr. Armen worked in the Iranian Air-force Hospital and helped establish a new dental office. Since moving to California and receiving his California Dental License, Dr. Armen has volunteered his time with USC mobile dental geared towards providing free oral health care to underprivileged children in the L.A. area.