Meet the Staff

Front Office Team

 Diem Nguyen

Diem Nguyen

Front Office Manager

Diem is a Seattle native who used to own a successful restaurant in the affluent Capitol Hill neighborhood before moving to the Bay Area to become an integral member and office manager of the Ueno Center. She loves to call Campbell her home as she loves the culture, people, and most importantly, the weather. She is an active member of AADOM (American Academy of Dental Office Managers) and takes pride in immersing herself in continuing education to ensure she can provide the best customer service for our patients. Her hobbies include meal prepping, beer yoga, wine tasting at Bevmo and petting her dog.

 Angela Lorenzo-Ramirez

Angela Lorenzo-Ramirez

Treatment Coordinator

Angela is a Bay Area native who was raised in Los Altos and currently resides in Campbell where our office is located. In her spare time, she enjoys shopping, dancing, and spending time with her family and friends. She has a fun loving husband, is a mother of 2 beautiful children and an avid New York Giants fan. Angela loves providing her patients with the highest level of customer service.


Erin Stuart

Financial Coordinator

Erin is a San Jose native and has been in the dental field for over 20 years. She specializes in insurance billing and coordinating financial plans, however, she is a registered dental assistant, so do not be surprised if you find her helping the doctors out. In her spare time she enjoys music, watching her friend play in his band, dancing, and watching movies. She is a mother of two children and is looking forward to being a grandmother in the future.

 Tamryn Carlotta, Carlotta

Tamryn Carlotta

Scheduling Coordinator

Tamryn was born and raised in Hollister and recently moved to the South Bay with her husband and daughter. She started her dental career 8 years ago, working in her father’s practice as part of his clerical staff and advancing to a dental assistant. She is currently going to school in hopes of becoming a registered dental hygienist. Educating the importance of oral health has become a passion.  In her free time, she enjoys spending time with her family, traveling, and watching her daughter grow.

Dental Assistants

 Dora Porter, Dental Assistant

Dora Porter

Back Office Manager and Implant Coordinator

Dora was Dr. Ueno’s first employee when the Ueno Center was Ueno Periodontics. She used to work in the field of endodontics before moving into the world of periodontics. She is married and has 2 beautiful daughters who look exactly like her. In her free time, she enjoys the different forms of martial arts and interpretive dance and is the top lip syncing performer in the office.

 Oral surgery office staff member, Romel Marquez

Romel Marquez

Dental Assistant

Romel is a San Jose native and lifelong sports fanatic. He enjoys working out and is an avid Charger fan. At the Ueno Center, Romel is a familiar face to our long time patients. He has aspirations of becoming a hygienist and is currently taking classes to make his dream a reality. He was also featured in multiple Warriors commercials and danced during the Superbowl halftime show when it was in Santa Clara. His other hobbies include cooking, dancing and singing karaoke.

 Gabriela Valencia

Gabriela Valencia

Lead Lab and Restorative Assistant

Gabriela is a proud Morgan Hill resident, however, she recently moved to San Jose. She loves dentistry and takes pride in making sure our patients look amazing with any restorative work we do in the office. In her spare time, she enjoys watching sports with her other half, leisure time with her family, and taking her dogs out for a morning run. Gabriela is delighted to be a part of the Ueno Center team and looks forward to treating you with the highest level of patient care.

 Ashley Alfaro, Registered Dental Hygienist

Ashley Alfaro

Lead Clinical Assistant

Ashley has been a surgical assistant her entire career. She started in oral surgery but has now found her home at the Ueno Center. Ashley implements and trains the assistants with any new systems that we put into place. She has an adorable son and is an avid Sharks fan. She tries to never miss a game!

 Tanaya Mendez, Registered Dental Assistant

Tanaya Mendez

Registered Dental Assistant

Tanaya originally worked in restorative dentistry and made a smooth transition into Periodontics. Along with Gabriela, she leads the restorative and lab efforts of the Ueno Center as she is an artist when it comes to her temporaries. She is the proud mother of 2 wonderful children and loves to read in bed in her free time.

 Michelle Hadley, Registered Dental Assistant

Michelle Hadley

Registered Dental Assistant

Michelle has been a wonderful addition to the Ueno Center as she originally started as an assistant in a general dentist office and has transitioned to Periodontics. She is a skilled assistant and loves interacting with her patients. She is married and has two beautiful daughters. In her spare time, she enjoys playing video games and reading comics.

 Gabriela Gonzalez, Dental Assistant

Gabriella Gonzalez

Registered Dental Assistant

“Gigi” is the life of the party and brings a great energy to the office.  She loves interacting with patients and always puts a smile on people’s faces.  Along with being a great surgical assistant, she excels with technology and takes lead on our “digital impressions.”  In her free time she loves to work out, ride her motorbike, and work on cars.  

Dental Hygienists

 Dayna Hashimoto, Registered Dental Hygienist

Dayna Hashimoto-Barao

Registered Dental Hygienist

Dayna has truly enjoyed all 13+ years of her dental career. She started as a dental assistant while completing her Bachelors Degree from UC Santa Barbara. Dayna then found a passion for dental education as she earned a Masters of Science in Dental Hygiene at UC San Francisco. She currently teaches in the Dental Assisting Program at Foothill College. Dayna enjoys working closely with her patients to provide individualized, gentle, and thorough periodontal treatment. When she is not busy cleaning teeth or teaching, she enjoys spending quality time with family and traveling.

 Susan Quan, Registered Dental Hygienist

Susan Quan

Registered Dental Hygienist

Originally from San Antonio, TX, Susan has been a clinical dental hygiene therapist since 1990 and is committed to helping our patients achieve their healthiest potential. She received her Dental Hygiene degree from the University of Texas, where she quickly developed a passion for periodontics. She later received a Master’s of Public Health from San Jose State University to understand health care in larger populations. Susan’s strong value for education also led to receiving her MBA, in which she is currently using to pursue entrepreneurial projects. Susan has helped to spearhead Ueno Center’s Oral Wellness Department because she believes that oral health is a key factor in living well. Through education and comprehensive oral hygiene services, her goal for every patient is: excellent health. When she is not practicing dental hygiene, Susan maintains a very active lifestyle that includes running, cycling, kayaking, adventure travel, food, and photography. She also has a love for all animals, sports and volunteerism. Her current memberships include The California Dental Hygiene Association, The American Academy of Oral Systemic Health, The National Association for Professional Women, The Commonwealth Club and The American Red Cross Volunteer Corps.

 Barbara Duncan, Registered Dental Hygienist

Barbara Duncan

Registered Dental Hygienist

Barbara is a California native as she was raised in San Jose/Campbell. She currently lives in San Jose with her husband, two daughters and her large white dog, Tucker. Barbara has been a part of dental teams for 25+ years and dedicated herself to Dental Hygiene in 2005 when she graduated from Foothill College in Los Altos. She is proud to support her professional organization and serves as a board member to her local dental hygiene component. Barbara has volunteered in several community outreach programs to support dental health to children and underserved patients. When she is not working with her patients to improve
their health she loves going to the beach, traveling and spending time with her family.