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Our Staff

Our BCBAs are here to support your family with a personalized approach

to ABA to ensure you get the most our of your ABA experience.

Chris Topham smiling
Chris Topham 

Hi, I’m Chris!


I founded Celeration ABA with my wife, who is also a BCBA, in 2020. Back then, we mostly focused on supporting families through the COVID-19 pandemic by providing telehealth ABA and academic support while their children weren’t in school.


Thanks to outstanding reviews and testimonials from our few families, within a few years of launch, we’d grown to be a profitable ABA company focused on delivering high-quality personalized ABA to families in the San Francisco Bay Area.


My wife and I live in San Mateo with two dogs and a toddler who keeps us learning new things every day.


Say hi here:

Team Member
Ana Severo

Hi, I am Ana!

I am a Board Certified Behavior Analyst. I am originally from Mexico and relocated to the Bay Area when I was 8 years old.


My interest in ABA began in 2015 when a family member was diagnosed with Autism and my family's journey with ASD and ABA began.


I have worked in ABA for 8 years. My treatment implementation experience ranges from working with clients ages 2-18 years of age. I believe in an ABA approach that supports client and family values, keeping my learners happy and supporting them in different environments.


Outside of Celeration ABA, I support a non-profit organization to provide high-quality ABA to underserved communities.

Jasen Wallace

Jasen here!

I started working in ABA in October 2018 after getting my Bachelor's in Psychology at UC Berkeley.


During COVID, I decided to pursue my Master's in ABA and began on the journey to becoming a full-fledged BCBA. Supporting parents during a global pandemic, and still finding ways to progress our clients is one of my proudest achievements, and I hope to continue finding new ways to support families regardless of what the world throws our way.


I believe strongly in a naturalistic, play-focused ABA style that allows children to be children.


My partner and I live in San Francisco with our cat Velociraptor and enjoy spending our free time walking around Golden Gate Park, Spikeball, and Pickleball with friends.

Selena Lum

Hi, I'm Selena!


My first job working with children was at age 15. I started working with autistic kids at the behavior technician level in 2006 as part of an ABA program at California State University, Sacramento (CSUS). I became a Board Certified assistant Behavior Analyst in 2014. I went to the Florida Institute of Technology (FIT) online and became a Board Certified Behavior Analyst in 2021.


Teaching through play is a key component of my approach, creating opportunities to develop desired skills through play.


In my free time, I like to use ABA both on myself as well as my pet cat. I'm always looking for the next new thing to learn about behavior and how that might be applied to help improve a family's life.

James Downs

Hi, I'm James.


I've been practicing ABA in the SF Bay Area for over 10 years. I've had the opportunity to work with various school districts, clinics, and home-based programs specializing in social communication and skill acquisition in the South Bay region.


My favorite aspects of ABA include providing inclusive and collaborative therapy, improving socially significant behaviors, and utilizing effective assessment tools to inform personalized care.


When I'm not working, you can find me spending time with family, playing sports, or practicing Jiu Jitsu with my son.

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