Meet the Team

Dr. Fay Mansouri, Endodontist, Portrait in yellow shirt

Dr. Fay Mansouri

Always thirsting for knowledge, Dr. Mansouri keeps up-to-date with the latest advancements in dentistry, endodontics, radiology, and sterilization. She has always gone beyond what is expected to offer only the best to her patients.

Dr. Mansouri’s approach to your treatment always starts with patiently listening to you. Then, after a complete and thorough examination, she reviews and discusses the diagnosis and treatment options with you. She is honest with her patients and she will always give time to her patients to ask questions.

Dr. Jimmy Pham

Dr. Jimmy Pham attended the University of California Irvine, majoring in Biology. He went on to earn his D.D.S. degree at the University of Southern California. After 6 years Dr. Pham continued his studies emphasizing in endodontics at Boston University, School of Dental Medicine. With years of experience, he uses his mastered dental skills to bring precision dental practices to all of his patients.

Dr. Pham uses the latest technology to provide endodontic services including root canals and endodontic surgery. His continued passion for education keeps him updated on the latest methods and the best options for his patients.

Dr. Michelle Lee

Dr. Michelle Lee has over 18 years of experience in the dental industry. Using the most advanced technology, Dr. Lee has successfully performed a wide range of surgical Endodontic procedures. She specializes in root canal therapy and root canal surgery and has received various awards and scholarships in the areas of clinical excellence, community service, and research. Dr. Lee has published in a variety of nationally circulated dental journals, and she has been a clinical instructor in Loma Linda dental school since 2001. Dr. Lee is an active member of the AAE, ADA, and CDA. She is a gentle, compassionate and experienced clinician who is committed to improving the oral health of all her current and future patients.

In her spare time, she enjoys spending time with her family, volunteering at school, cooking healthy meals, and walking on the beach.

Dr. Jason C. Cho

Dr. Cho earned a Bachelors of Arts Degree, with commemoration, in Biophysics from John Hopkins University, a world leader in research and education. He earned a degree in dental medicine at UCLA and continued at the prestigious Ivy league University of Pennsylvania earning a Certificate in Endodontics.

Dr. Cho is a board-eligible member of the American Board of Endodontists and is an active member of the AAE, ADA and CDA.


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Bill has been in the dental field since 2004. He began his career as a graphic designer, since then he has held several positions within a dental office, and has been an office manager for the last ten years. His experience in patient care, insurance, and customer service is an asset to our office. His passion for helping patients shows in his willingness to go above and beyond.

He lives in Lake Forest. During his spare time, he enjoys spending time with his twins going to the park or the movies or just playing games.

He is available during office hours to help or answer any questions or concerns you may have. Consider him your personal concierge at Irvine Endodontics.


Mike Nguyen is our Lead Assistant. He received his certification locally, but is originally from the East coast. His extensive training and experience assisting specialist dentists makes him a tremendous addition to the Irvine Endodontics team. As a team lead, he ensures that all of our dental assisting staff are trained and ready to assist. He also oversees that all of our high quality materials are ready for any patient that walks through our doors. He is an asset to our team and the person to go to for dental assisting expertise.

On his time off, Mike is an automobile enthusiast and enjoys exploring Southern California with his lovely wife.


Brittney is a fun-loving young mother, fitness model, and friend, who loves being surrounded by her family and friends. Brittney helps with the front office as well as the back office, ensuring instruments are sterilized and patients are comfortable during procedures. In a way, Irvine Endodontics and my team are like family to me. Our patients are phenomenal and we all work really hard to help our patients receive the best treatment and a happy experience. What I love most about my job is helping patients in pain and making sure their mouths are happy and healthy.

Outside of work, Brittney loves to spend time with her family, hit the gym or go to the beach, complete DIY projects, and cook healthy nutritious meals that taste yummy.


Thao is the new friendly face here at Irvine Endodontics. She is a part of our front office, back office, and marketing team. Her passion for dentistry is what drives her as she loves giving patients best professional care possible. Thao received her B.S. in Public Health Science from University of California, Irvine and since had extensive experience with patient care. Thao was involved in neurocritical researches at her university, patient relations at UCI Medical Center, and participated in several Be The Match: The National Marrow Donor drives. She hopes to become a dentist in the future in order to bring confident smiles to everybody.
In her spare time, you can almost always find her at a local Starbucks or library studying for her entrance exams and classes, or trying to be Instagram famous (you know, in case Dentistry doesn’t work out). Her other hobbies include cooking, working out, and exploring the next big eateries around town with her significant other


Ruby is certified and trained in dental assisting and loves the science of dental arts. Her smile and quirky attitude make any patient’s experience a fun and memorable one. With her extended knowledge in dentistry, she plans to continue studying oral health and dentistry in order to one day be an endodontist! You’ll know her immediately from her smile and bubbly personality. With Ruby, you are sure to have fun at your appointment.

In her spare time, she likes to spend time with her family and friends.


Dia was born and raised in Thailand. She moved here in 2004. She is fluent in reading and writing in Thai, Laos, and Hmong. Dia started learning English at the age of 13 years-old; learning English was not the easiest, however, she learned to use flash cards to help her memorizing words and relating it to images or arts that she drew in the back of each flash cards.

Dia started eighth grade and then went on to graduated high school in a small town called Merced, Central California. After high school, she then transferred to California State Polytechnic University, Pomona. Dia earned a Bachelor’s Degree of Science in Management and Human Resource.

Prior to working as a Dental Assistant and Marketer here, she worked with five hundred fortune corporation companies for several years. However, Dia has always loved the interactions with people. Dia absolutely valued the interactions with people because she connected on a personal level with individual people. In which, she did not often get the interactions with people while being with corporation companies. That was when she decided to make a change of career and here she is very happy with Irvine Endodontics!

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