San Gabriel Valley/Pomona, CA

Behavior Frontiers
126 West Olive Avenue
Monrovia, CA 91016
Phone: 626.239.3060
Fax: 855.568.2494


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Behavior Frontiers is proud to announce that we are bringing our exceptional applied behavior analysis (ABA) treatment program and clinicians to San Gabriel Valley/Pomona, California. We currently provide applied behavior analysis (ABA) treatment services to children in the home, school, or community settings. Our ABA treatment services are designed to help children reduce their problem behaviors and learn appropriate replacement behaviors, such as socialization and communication skills. Families access our ABA treatment services through school district, insurance company, regional center, or private funding.

Service Locations

Behavior Frontiers’ clinical staff members are currently able to serve clients in or near the following cities:

Azuza, Baldwin Park, Chino, City of Industry, Claremont, Glendora, Hacienda Heights, LaVerne, Montclair, Ontario, Pomona, Roland Heights, San Antonio Heights, San Dimas, Upland, Walnut, West Covina.

We are open to extending our range of service to additional areas and to contracting with additional school districts, regional centers, and insurance companies. Please contact our office at 310-856-0800 if you do not see your location listed above. Families located out of our service area can also receive our online ABA training for parents and professionals through Behavior Frontiers Online Training Center.

Insurance Company Services

Did you know that recent California law mandates that most health insurance plans cover ABA treatment for children with autism spectrum disorder? Behavior Frontiers has contracts with health plans so that we can provide this medically necessary treatment to children with autism spectrum disorder. Please contact us today to find out if your child’s health insurance plan will cover these benefits at 1-888-922-2843.

Behavior Frontiers is an in-network provider for the following commercial health plans within California: 

  • Aetna

  • Anthem Blue Cross

  • Blue Shield (managed by Magellan)

  • Cigna

  • ComPsych

  • Humana (managed by LifeSynch)

  • Kaiser (managed by Easter Seals’ Behavioral Health Network)

  • LifeSynch

  • Magellan

  • Oscar

  • Tricare (West Region, managed by MHN)

  • United Behavioral Health (Optum)

Behavior Frontiers also provides ABA services to clients through the following Medi-Cal Managed Care Plans in California:

  • Anthem Blue Cross – Medi-Cal

  • Care1st

  • Kaiser – Medi-Cal

  • LACare

  • Molina Healthcare

If your child is a beneficiary of one of these health plans, please contact our office today at 888-922-2843 so we can verify benefits. 

We are also in the process of finalizing contracts with additional health plans. Please contact us if you do not see your health plan listed so that we can discuss your options

Regional Center Services

We provide ABA services for children through California Regional Centers. California Regional Centers are nonprofit private corporations that contract with the California Department of Developmental Services to provide or coordinate services and support for individuals with developmental disabilities.




Diana Betsis, M.A., BCBA
Senior Clinical Director

Diana Betsis received her Master's degree in Applied Behavior Analysis from Pennsylvania State University in Harrisburg, Pennsylvania. The following year she received her certification as a Board Certified Behavior Analyst (BCBA). Diana has worked with children and adolescents with autism and other developmental disabilities. During her graduate studies her work and internships focused on adolescents with severe self-injurious and aggressive behaviors. Diana has worked as a Behavior Therapist and Behavior Supervisor in home, school, and community settings. Diana is an Experienced Clinical Director with a demonstrated history of utilizing ABA with clients with developmental disabilities. Skilled in Adolescent and Early Intervention Therapy, Crisis Intervention, Applied Behavior Analysis, and Public Speaking. 


Joy Wong, M.A., BCBA
Clinical Director, San Gabriel Valley Region

Joy Wong received her Bachelor's degree in Psychology with an Applied Developmental Psychology minor at UCLA where she was introduced to the field of ABA through a course taught by Dr. O. Ivar Lovaas. After working as a Behavior Interventionist for over 5 years, she became a Case Manager/Supervisor while continuing her education to receive her Master's degree in Teaching with an Applied Behavior Analysis Specialization from National University and obtain her certification as a Board Certified Behavior Analyst (BCBA). Joy has worked with typical developing children and those diagnosed with Autism Spectrum Disorder (ASD) and other developmental disabilities aging from infants to adolescents since 2002. She has experience in the child care setting, providing private consultation, working with school districts and providing ABA services to clients funded through regional centers, school districts and insurance.
Joy oversees the clinical programs of clients in the San Gabriel Valley area. She is dedicated to helping children and their families reach their fullest potential by providing parent education, individualized treatment programs and ongoing support to her team with collaboration between her clinical staff and families. 


Elizabeth Gudiel M.A., BCBA
Associate Clinical Director, San Gabriel Valley Region
Elizabeth Gudiel began her career in the field of Applied Behavior Analysis in 2010 as a Behavior Interventionist, shortly after she was promoted to a Senior Bi and then to Case Manager/Supervisor. She continued her education and received her Master’s degree in Teaching with a Specialization in Applied Behavior Analysis from National University in 2012 and obtained her certification as a Board Certified Behavior Analyst (BCBA). Elizabeth has worked with individuals with Autism Spectrum Disorder (ASD) and other developmental disabilities aging from infants to adults. She has experience in implementing ABA strategies in home, school, daycare, and community settings. She is dedicated to provide high quality services, individualized and client centered treatment plans, and ongoing collaboration with her clinical teams and families.