About Tate

We empower others through science

Tate Behavioral is a leader in behavioral, speech language and AAC/AT services, providing home, school and community-based support to individuals with disabilities and their families. We are a group of Behavior Analysts and Speech Pathologists/AAC/AT Specialists committed to progressive practice. We focus our service delivery on learner skill advancement, independence and autonomy.  


“Our goal is lasting, socially significant behavior change.”

Christina Rizzo, MFA, BCBA, LABA

Owner/CEO, Tate Behavioral

Our Mission

We are committed to the science of Behavior Analysis as it applies to all individuals and to contributing to the Behavior Analytic community through research and innovative programming. We believe that anyone can learn and that all individuals have the right to reach their fullest potential through high quality teaching-learning opportunities. At Tate we find joy in being with our clients. We embrace healthy challenges and transform the boundaries of what support looks like to ensure limitless, lifelong learning.

Accepted Health Care Plans

Our Employees

Christina Rizzo Tatreau, MFA, BCBA, LABA

Owner / CEO

Christina Rizzo founded Tate Behavioral in 2013 with the goal of bringing high quality in-home and school-based ABA services to Western MA. After treating individuals of all ages with varying abilities for over 16 years, Christina currently oversees the day-to-day operations of Tate Behavioral while still maintaining a small client caseload. Christina holds a BA from Clark University, an MFA from Bennington College and completed her coursework in Applied Behavior Analysis at Florida Institute of Technology. A former writer, her clinical passions are Applied Verbal Behavior, social skills instruction and schedules of reinforcement. She enjoys running, cooking, gardening and spending time with her family. Christina received a spot on the Forbes NEXT1000 2021 list, a designation honoring small business entrepreneurs redefining the American dream.   


Kelley St. Clair, M.A., BCBA, LABA

Executive Clinical Director

Kelley is a Licensed and Board Certified Behavior Analyst with 15 years experience supporting children and families living with Autism, Developmental Disabilities, and challenging behaviors. She is a graduate of Smith College and received her Masters degree in Applied Behavior Analysis from Westfield State University. Kelley has worked in Early Intervention ABA Specialty Services, as a teacher and counselor at a residential school for children with special social-emotional-behavioral needs, as a consultant to daycare centers as part of the Massachusetts Early Childhood Mental Health Consultation Program, providing In Home Behavioral Services as part of the Children’s Behavioral Health Initiative, and as a consultant to private families and public schools. Kelley has served as a board member at Jericho in Holyoke and currently serves as a member of the Human Rights Committee at the Berkshire Hills Music Academy in South Hadley, MA. Kelley is passionate about providing Applied Behavior Analysis services to young children and their families, educating parents and teachers, and sharing the science of ABA with the world!

Erica Nason, M.A., BCBA, LABA

Clinical Director of Vocational Programming

Erica earned a B.A. in Psychology and a M.A. in Applied Behavior Analysis from Westfield State University. She then became a Board Certified Behavior Analyst and received her License in Applied Behavior Analysis. Since 2010 she has worked with clients with Autism, social/emotional disorders, or other developmental disabilities, that display challenging behavior in the school and home setting. She has worked training families and after school program staff on implementing programs and procedures in applied behavior analysis. Additionally she has participated in and run social skills groups within schools and after school programs. Her passion includes bridging the gap between school-aged children and adults to ensure clients are able to reach their full adult independent potential. She is currently working on developing Vocational Skills and Adult Life Skills programming for Tate Behavioral.
Beyond Erica’s passion for ABA, Erica cares deeply about social and environmental justice. She loves music, dance, and comedy.

Christopher Dillon

Director of Integrated Programming

Chris Dillon is the Director of Integrated Programming at Tate Behavioral Inc. and has been with Tate since its inception. Chris got his start in the field of behavioral health job coaching and working in the residential setting before he shifted gears, attended Simmons University’s ABA program and began working with children in 2008. Under the supervision of Christina, he was recognized by the Asperger’s Association of New England in 2012 with an award for promoting learning and understanding in schools.


Abby Wellspeak, M.A., BCBA, LABA

Clinical Director of In Home ABA

Abby Wellspeak is the Director of the Tate At Home division of Tate Behavioral. With more than 10 years of experience in the field of ABA, she is our resident expert on all things insurance related, including writing treatment plans and working to secure funding for home programs. She also works in homes training parents and supervising future BCBAs.
Abby has been providing ABA services to families and individuals with disabilities in homes, residential settings, and public and private schools throughout Western Massachusetts since 2008. Abby graduated with a Master’s in Applied Behavior Analysis from Westfield State University in 2013 and has been a Board Certified Behavior Analyst and Licensed Behavior Analyst since 2014.
One of her passions is working directly with families to help integrate her clients into their community, through doctors appointments, dance classes, and family vacations. Outside of the office, Abby most likely to be found spending time with her son “PJ”, sipping on iced coffee, or conquering any board game challenge.


Emily Croteau, MS, BCBA, LABA

Senior BCBA Supervisor 

Alyssa Sorrentino, MA, BCBA, LABA

BCBA Supervisor

Natasha Kislyuk, BCBA, LABA

BCBA Consultant

Andrew Steplar, MA, BCBA

BCBA Consultant

Kaitlyn Taliceo, MA, BCBA

BCBA Consultant

Anna Courtois, MA, BCBA, LABA

BCBA Consultant

Tony Watt, BCBA, LABA

BCBA Consultant

Nicole Bosse, BCBA

BCBA Consultant

Heather Castonguay

Lead Behavioral Instructor

Marissa Yeager, RBT

Lead Early Education Teacher

Sarah Laushance

Integrated Programming Curriculum Coordinator

Natasha Sweetser, RBT

Behavioral Instructor

Yodha Sharma

Behavioral Instructor

Nicole Ouimette

Lead Behavioral Instructor/Special Education Teacher

Diane Cashman

Behavioral Instructor

Nathan Edwards

Behavioral Instructor

Amanda Wyckoff

Behavioral Instructor

Sydney Boden

Behavioral Instructor

Rachel Guerin

Behavioral Instructor

Anthony Rizzo

Behavioral Instructor

Marc Ruffin

Behavioral Instructor

Andrew Turgeon

Behavioral Instructor

Nerissa Hall, PhD. CCC-SLP

Speech Language Literacy Clinical Director

Hillary Jellison, MS, CCC-SLP

Speech Language Literacy Clinical Director

Emily Donoghue, MA, CCC-SLP

Speech Language Pathologist

Michele Yeager

Human Resources Specialist

Lily Hartley-Robles

Early Education Lead Teacher

Paige Dickson

Behavioral Instructor

Brittany Sourdiffe

Behavioral Instructor

Erika Flannery

Behavioral Instructor

Emily Walker

Behavioral Instructor

Lindsay Baldyga

Office Manager/Behavioral Instructor

Helena Cruz-Blefeld

Behavioral Instructor

Danny Lee

Behavioral Instructor

Daniel Mudd

Behavioral Instructor

Jessica Santos


Kayleigh Croteau


Amy Johnson

Behavioral Instructor

Alison Stitsinger

Behavioral Instructor