Meet the Team

We recognize that all our patients are unique and deserve to receive orthodontic care that reflects their individual needs. Our experienced and talented team is committed to working with you and your family to create a comfortable, stress-free, and rewarding orthodontic experience every time you visit our practice.

We are pleased to welcome you and your family, and we look forward to working with you.


Insurance Coordinator / Administration

I joined Diablo Orthodontic Specialists in 2019, to take care of insurance coordination and other administrative tasks. I enjoy interacting with the patients and their families, and providing top-notch customer service. My goal is to be an advocate for our patients to make sure they receive all the insurance benefits they’re entitled to.

I have lived in the Brentwood area for 20 years. I am married with three kids and an amazing Basset Hound that is basically my fourth child. My family enjoys boating on the Delta in the summer and snowboarding in the winter.


Registered Dental Assistant / Orthodontic Assistant

I have been a dental assistant since 2005. With Diablo Orthodontic Specialists since 2018, I love how every day is different and how each patient grows and changes as they move through treatment. It’s a great feeling to watch someone gain confidence and start to love their smile! Orthodontics is a lot of fun and our team works together for excellent outcomes.

I have two daughters and a Chihuahua named Chica. I love being outdoors and watching football, as well as cooking and baking.


Registered Dental Assistant / Orthodontic Assistant

I brought with me more than 17 years of experience as a dental assistant when I joined the Diablo Orthodontic Specialists team in 2021. I work alongside Dr. Yosh when we put braces on, adjust them throughout treatment, and finally take them off at the end! I like to see our patients’ changes from start to finish, not only in their smiles but in their personalities as well. My goal is to provide my patients with the best care possible.

My husband Wilson and I have two sons, Arsten and Arkayden. I enjoy cooking and spending time with my family.

Tammy RDA

Treatment Coordinator

I began my career in dentistry in 1979, when I earned my certification in dental assisting and later, in orthodontic assisting. I joined the Diablo team in 2012, when I transitioned into an administrative role as our treatment coordinator. I greet all our new patients and make them feel comfortable, take diagnostic records, go over treatment plans, and set up payment plans. I love getting to know our patients, and watching their personalities bloom once they get the smile they’ve always wanted.

I grew up in Lodi and recently moved to the area. I have one son, a daughter-in-law, and two wonderful grandchildren, finally making me a grandmother! I love spending time with my family, watching my granddaughter play softball and compete in hip-hop dance, and playing with my new grandson.

Yosh Sakasegawa, DDS, MS
2400 Balfour Rd, Suite 315 Brentwoord, CA 94513
(925) 634-9794
Mon 8:30am to 5:30pm
Tues 8:30am to 5:30pm
Wed 8:00am to 5:00pm
Thu 8:00am to 5:00pm
Fri 8:00am to 5:00pm