Meet The Team

Meet Our Friendly Dental Team At Dick W Koo, DDS

Elizabeth Pena

Office Manager, RDA

Joined Dr. Koo’s Office 2019

Elizabeth graduated from San Jose City College in 1999 as a Dental Assistant. In the course of the past 22 years, she has worked in both the front and back office. Maintaining her RDA, she keeps current with up-to-date training in order to better assist patients. With her extensive experience she enjoys helping patients understand their insurance, as well as making them feel at ease with any other dental related questions. When not helping patients maximize their dental benefits, she enjoys spending time with her husband of over 30 years, her kids, grandkids, two Sheppard’s, “Sasha & Marley”, camping, traveling, and attending Live Country concerts. 

Diana Hernandez


Joined Dr. Koo’s Office 2019

Diana began her career in the dental field after realizing she wanted to work in a profession where she could positively impact people. Dentistry has allowed her to achieve this by seeing change within patient’s smiles. She began her Dental Assisting journey in 2017, graduating shortly after. She continues to further her knowledge and education by staying up to date with the latest CE Courses. When in the office, she looks forward to making patients feel at ease for their dental procedures as well as catching up with patient’s latest travels. In her free time, she enjoys volunteering at her local church, spending time with her family, friends, and dog named “Bella”. She also enjoys trying new foods, viewing the sunset, and visiting the beach every chance she gets.

Emily Thompson

Registered Dental Hygienist

Joined Dr. Koo’s Office 2016

 Emily began working in the dental field as an RDA for 6 years before returning back to Carrington College, graduating in 2009 as a Dental Hygienist. Now being in the field for 20 years, she takes pride in being able to share her acquired dental knowledge with Dr. Koo’s wonderful patients. Emily finds this, “extremely rewarding”. When she’s not in the office, she enjoys spending time with her loved ones, working out, trying new recipes, traveling, and escaping to her family Cabin in Aptos with her dog, “Chloe”.

Alisa Barry

Registered Dental Hygienist

Joined Dr. Koo’s Office 2016

Alisa graduated as a Dental Assistant in 2001. Her passion in dentistry drove her to attend hygiene school shortly after, thus, resulting in her working part-time as an assistant while attending Foothill College. In 2003, she graduated with her AS Degree in Dental Hygiene. She has enjoyed working in private dental offices for the past 19 years, where she takes pleasure in treating and educating patients on all aspects of their oral health needs. When not in a clinical setting, she enjoys spending time with her husband of 12 years, and her 2 wonderful children. 

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Dick W. Koo, DDS | 827 Blossom Hill Road, Suite E8, San Jose, CA 95123

(408) 578-4700