Meet our Team
Dr. Zak Dental Care has been serving the community of Southern California since 1994.
At Dr. Zak Dental Care, we are dedicated to continuously teaming up with the most qualified dental professionals and specialists.
Manager of Recruiting & Team Building
Practice Development & IT Specialist
Director of Operations
Shelmira De Leon,
Accounts Payable Analyst
Dr. Zak Dental Office Manager in Agoura Hills
Dr. Zak Dental Office Manager in Downey
Dr. Zak Dental Office Manager in Long Beach
Dr. Zak Dental Office Manager in San Diego
Dr. Zak Dental Office Manager in San Dimas
Dr. Zak Dental Office Manager in Simi Valley
Dr. Zak Dental Office Manager in Temecula
Dr. Zak Dental Office Manager in Valencia
My name is Shirley and I have spent the past 24 years serving others in the dental field. I love people and enjoy working with others. I have hands on experience with patients in both the back office as a dental assistant, as well as all aspects of front office administration, including insurance billing and coordinating treatment. I enjoy helping others find the best way to move forward with the exceptional care they deserve. I have dedicated my efforts to making sure our patients receive quality, personalized care and are comfortable at all times. I enjoy spending time with my grown children and grandchildren as often as possible, and of course we cannot forget our fur babies, who are also an essential part of our family and are involved in many outdoor family activities. I look forward to continuing my service to others!
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. Zak ensures that the dental care that is provided at Zak Dental offices is wholistic, comprehensive, and enhances patients’ overall wellness.
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. He utilizes his keen understanding of comprehensive dental care to ensure that his treatment plans are optimized for the ultimate goal of enhancing patients’ wellness. In his free time, Dr. Kopel loves to race fast cars, play tennis, and spend time with his family.
Dr. Karnakova graduated from the Moscow Medical Stomatological Institute in 1991. She 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. Karnakova’s approach to patient care is wholistic to ensure a strong and positive link between oral health and patient wellness.
Dr. Olga Karnakova is fluent in English and Russian languages.
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 is a member of the American Dental Association and California Dental Association. His work is always precise and performed calmly, making him very popular with patients.
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 in implantology to every patient that she sees and treats. Dr. Nadia is an avid believer in developing treatment plans that are designed to enhance patients’ oral health and optimize their overall wellness.
Dr. William Olson attended Loma Linda University, graduating in 1987. His entire family is in the medical field which is what made him become a dentist. His passion is doing restorative and 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. Nima Aleagha graduated from the Azad University in 1994. He provides quality dental examinations for his patients, caring for adults and children in the practice. With over 25 years of experience, Dr. Aleagha provided treatment plans for thousands of patients over the years. Dr. Nima is fluent in Farsi as well as in English.
Dr. Paul graduated from USC Dental School. He has more than 15 years of experience in the dental field. Dr. Paul has been treatment planning and treating more than 50,000 patients. Dr. Paul’s emphasis on the patients’ overall well being and his ability to prioritize treatment plans to any budget has allowed his to enhance the oral health of nearly all patients that he sees irrespective of their financial challenges.
Dr. Mai Phan initially received her Bachelor’s degree in Electrical Engineering from the University of California, Irvine. Then, Dr. Mai Phan went on to obtain her DDS from USC. She is a gentle individual by nature, and strives to provide great services and care to her patients. Dr. Mai Phan tries to complete her work in a fashion she truly stands behind. Her expertise as a dentist is laser assisted periodontal management, hygiene cosmetic fillings, veneers, inlay/onlays, teeth whitening. In her spare time, D. Mai enjoys books, traveling and spending time with her family.
Dr. Kristen Miller is graduated from UCLA with general dental education and UCSF with her orthodontist training. She graduated the class as top 5% students. She was also the Vice President of her dental school class. Dr. Miller participated in the UCSF mobile clinic. She is fluent in Spanish.
Dr. Pedram Fakheri is proficiently trained in all aspects of periodontics including dental implants, non-surgical and surgical treatment of periodontal diseases, and periodontal bone regeneration. He graduated with his DDS from the University of Medicine & Dentistry of New Jersey in 2008. Moving from East to West coast, he then received specialty certification in Periodontics from Loma Linda University in 2011. In addition to providing high quality care to all of his patients, Dr. Fakheri is fluent in English and Farsi.
Dr. David Gonzalez attended Marquette University School of Dentistry, graduating in 1990. His passion is to help people feel good about their smiles and to help them overcome their fear of the dentist. He loves to make his patient’s experience as painless as possible. He became a dentist here in San Diego after visiting and loving the weather, the scenery, the food and the people. One fun fact about him is that he loves to restore Japanese cars to place them in shows and he loves horses and dogs.
Dr. Violetta Kenigsberg attended UCLA before pursuing her Doctor of Dental Surgery degree at Columbia University College of Dental Medicine. She then pursued her Advanced Education in Periodontics at the NYU College of Dentistry. Her favorite part of her new position is getting to work with such an amazing team as she addresses the periodontal needs of the community!
Dr. Kenigsberg actually met her husband while she attending dental school in New York. Together, they lived in New York for eight years and had a beautiful daughter named Renee there. In October of 2015, they decided to move to Los Angeles, where their second daughter Nicole was born. She holds great pride in her career and her family.
Dr. Ali Aldabe graduated from the Southern Illinois University School of Dental Medicine with his DDS. He is diligent in his pursuit to stay current in providing the profession’s leading dental care procedures while utilizing state-of-the-art technology, supplies and equipment.
Dr. Aiham Machhadani graduated from Damascus University in Syria in 1999. He then continued his education at California's Dr. Duggan Study Institute. Dr. Machhadani then continued his education at Columbia University, earning his specialty certification in Endodontics in 1999. For nearly 20 years, Dr. Machhadani has serviced patients in southern California. In his spare time, Dr. Machhadani lives an active life playing soccer and tennis.
Having served as a Navy dental officer in Okinawa, Japan, Dr. Durschlag has provided comprehensive and individualized dental services across the globe. Graduate of Loma Linda University, he was granted his Specialty Certificate in Orthodontics and Dentofacial orthopedics. On weekends, he enjoys staying active - playing hockey, golfing, skiing, and fishing! With roots in New York and San Diego, Dr. Durschlag is thrilled to provide you with quality results and nothing but the best of care.
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.
Dr. Marre is a California native who grew up in the San Francisco Bay Area. He attended California Polytechnic State University San Luis Obispo where he earned his Bachelor of Science degree in Biology and a minor in Biotechnology. He continued his education at the University of the Pacific, Arthur A. Dugoni School of Dentistry where he received his Doctor of Dental Surgery (DDS). With a passion for surgery, Dr. Marre was accepted into the respected oral and maxillofacial surgery residency program at the University of Louisville. He furthered his education at the University of Louisville School of Medicine where he earned his Doctorate of Medicine (MD) and completed a general surgery internship within the Department of Surgery. During his six years of oral and maxillofacial surgery residency, Dr. Marre focused on advanced facial reconstructive surgery, complex implant surgery, orthognathic surgery, ambulatory anesthesia, and facial cosmetic surgery. Upon completion of his residency, Dr. Marre returned to practice in California close to his family and friends. Outside of surgery, he enjoys spending time with his wife in San Diego participating in outdoor activities such as tennis, running with his dog, going to the beach, and hiking local trails.
Dr. Mark Riedler was born and raised in San Diego and graduated from USC Dental School in 1979. Thereafter, he practiced over two years in a county school dental clinic in northern Switzerland and one year in the adult dental clinic affiliated with the University in Lausanne, Switzerland. He purchased his own practice in 1984 which is now part of Dr. Zak Dental Care, and has since provided the full range of dentistry. His professional dental philosophy has been to help patients achieve and maintain their dental health through regular dental visits. Helping keep his patients healthy has been his greatest satisfaction professionally.
Dr. Riedler has been married to his beautiful college sweetheart for 44 years. He has three grown children, all happy and successful in their professional careers, and three grandchildren. Dr. Riedler's family interests have always included traveling and photography. He also rides bikes with his brothers weekly since 1973 and is proud to have ridden to the top of Haleakala volcano on Maui at the age of 62. Since 1983, Dr. Riedler and his two brothers play racquetball weekly. Lastly, he is a ‘plant nut’ and has taken plant expeditions to Madagascar and South Africa.
Dr. John Costandi is a Board Eligible Oral and Maxillofacial Surgeon. He graduated from Boston University School of Dental Medicine, where he was nominated and inducted into the BU Chapter of OKU Honor Society. He then completed his Oral and Maxillofacial Surgery training at Columbia University/New York Presbyterian Hospital in NYC. During his time at Columbia University, he earned his medical degree from Columbia University College of Physicians and Surgeons, completed a one-year internship in General Surgery, acted as Chief Resident during his last year of training and received the interdepartmental resident of the month award for his exemplary patient care.
After he completed his surgical training he joined Weill Cornell Medical College as an Assistant Professor of Surgery in the Division of Oral and Maxillofacial Surgery. During this time he performed full scope oral and maxillofacial procedures including dentoalveolar surgery, complex dental implant surgery, oral rehabilitation and reconstruction, corrective jaw surgery, benign maxillofacial pathology, and pediatric oral and maxillofacial surgery.
During his time at Weill Cornell Medical College he trained/mentored future Oral and Maxillofacial Surgeons.
Dr. Costandi has been published in peer-reviewed journal articles, abstracts and book chapters. He is an active member of the American Association of Oral and Maxillofacial Surgeons, American Dental Association, International team for Implantology and Academy of Osseointegration.
He relocated to Southern California with his family, where he continues to provide exceptional care to communities across a majority of Los Angeles County. He enjoys spending his free with his family.
The Zak Dental 360 Degree Quality Control Method:
We don’t just talk the talk…We walk the walk when it comes to Quality Assurance!!!
|1.||We have a Wellness Doctor on staff at every one of our locations. The sole purpose of this Doctor is to understand your unique oral health needs, objectives, and budget. Once your Wellness Doctor understands your needs, he creates a customized treatment plan that is unique to you. Based on the treatments needed, the Wellness Doctor will build a clinical team consisting of a hygienist, treating dentist, and possible specialists to execute the agreed upon family dental plans.|
|2.||There is always more than one provider working on your treatment plan to confirm the accuracy of your diagnosis.|
|3.||We practice a team-based approach to dental care because dental care requires a vast array of skills and abilities. In nearly thirty years of practice, Dr. Zak has never met a true “Master of All Trades” dentist. That is why we have paired up with a team of specialists that include: periodontists, endodontists, prosthodontists, oral surgeons, and orthodontists to support our general team and step in for more complex procedures.|
|4.||We have a 360-degree quality control protocol in place where at the end of your treatment your Wellness Doctor steps back in to check the quality of the completed work.|