Our Staff


Christine Kim Walton, Ph.D., BCBA-D, LBA  


Dr. Walton is the Director of Behavior Analysis No Ka Oi, Inc. She was born and raised in Honolulu, Hawaii and has been working with children and adults with autism and developmental disabilities for over 20 years. She earned her Bachelor's Degree in Psychology from Loyola Marymount University, her Master's Degree in Psychology from the University of Nevada Reno's Behavior Analysis Program under the direction of Dr. Jim Carr, and her Ph.D. in Psychology in West Virginia University's Behavior Analysis Program under the direction of Dr. Philip Chase. In addition, she respecialized in Clinical Psychology at the University of Hawai'i and completed her clinical internship at the Department of Veterans Affairs. She worked as the Behavior Consult Team Coordinator and the Mental Health Division and Developmental Disabilities Division Liaison for people with co-occurring developmental disablities and mental illness in the Department of Health. She currently works part-time at the Developmental Disabilities Division. Dr. Walton has been a Board Certified Behavior Analyst since 2000 and is also a Licensed Clinical Psychologist. In her free time she enjoys running, hiking, and practicing yoga.


Sara Sato, M.Ed., BCBA, LBA

Sara is the Director of Education and Training of Behavior Analysis No Ka Oi, Inc. She is a Board Certified Behavior Analyst and holds a Masters Degree in Special Education, Severe Disabilities/Autism Specialization from the University of Hawai’i at Manoa. She also completed her Bachelors of Arts in Psychology and Japanese from UHM and BCBA coursework from Florida Institute of Technology. Sara has worked with children with Autism and other disabilities since 1999. She has served as an educational assistant in Special Education classrooms, as a paraprofessional for several behavioral companies, special education teacher in the DOE and as a Lead Instructor at BANKO. Additionally, Sara lived in San Francisco for several years and worked as a Behavior Analyst in the school and home settings. She is an active member of the Hawai’i Association for Behavior Analysis (HABA) and currently serves as the Legislative Committee Co-Chair. During her free time, Sara enjoys spending time with her family, going to farmers markets and practicing yoga.


Kathryn Larson, M.A., BCBA, LBA


Kate is a Board Certified Behavior Analyst with a Masters in Clinical Practices in Psychology from the University of Hartford. She completed her Bachelor of Arts in Psychology at Southern Connecticut State University and completed her BCBA coursework through UMass Lowell. Kate has worked with children and adolescents with Autism in the ABA field since 2004 and has worked in multiple settings including a private ABA day school in Connecticut, a clinic setting in Virginia, as well as in homes in Virginia. In particular, Kate is interested in feeding programs and verbal behavior. In her free time, Kate enjoys spending time with her cats, crocheting, swing dancing, and diving for sea glass and shells.


Chanel Kealoha, Psy.D.


Dr. Chanel Kealoha earned her Bachelor’s Degree at the University of Southern California then went on to obtain her Master's and Doctorate degrees in Clinical Psychology at Pepperdine University. She completed a doctoral fellowship at Kapiolani Medical Center where she received intensive training in the assessment and treatment of families referred for issues related to child abuse. Dr. Kealoha is licensed to practice in Hawaii and has more than 10 years of experience providing clinical services. She has focused her training on Child and Adolescent Psychology, particularly the assessment, diagnosis, and treatment of Autism Spectrum Disorders throughout the lifespan. Her clinical background has been largely influenced by her interest in culturally-appropriate therapies and assessment. Through her research, Dr. Kealoha has sought to improve the relevance of mental health care and education for the Native Hawaiian community and her research on an alternative treatment for depression has been published in a nationally recognized medical journal.


Joni Wong, M.S.W., BCBA, LBA


Joni is a Board Certified Behavior Analyst who received her Bachelor of Social Work from University of Portland and her Master of Social Work, with the concentration area of Child and Family, from University of Hawaii, Manoa. She has worked at BANKO as a Lead Techinician for several years, and had 6 years of experience working with children and teenagers in various settings prior to joining the BANKO 'ohana. Joni was a part-time teacher at an alternative learning center, an after school care group leader, and a basketball and softball coach. In her free time, she enjoys boxing for fitness, watching movies, outdoor activities with friends and family, and taking her dog to the park.


Andrea Keesey, M.S., BCBA, LBA


Andrea is a Board Certified Behavior Analysis. She earned her master’s degree in behavior analysis at Simmons College in Boston, Massachusetts and her bachelors of arts in psychology and education at UMass Lowell. She has spent the last couple years working with children with autism and has experience teaching social skills groups to both children and adolescents. During her free time she likes to travel, hike, practice yoga and has taken up surfing and ukelele playing since moving to Hawaii.


Annette Chew, M.F.T., BCBA, LBA


Annette is a Licensed Marriage and Family Therapist and Board Certified Behavior Analyst. She was born and raised on the island of Oahu, where she has dedicated her work to supporting and strengthening the families that she has had the honor to work with. Her clinical experience includes a wide array and blend of psychotherapy and behavioral therapy. She received a Bachelors degree in Sociology from the University of Hawaii In Manoa and a Masters degree in Counseling Psychology with an emphasis in Marriage and Family therapy from Chaminade University. When she is not at work, Annette enjoys being with her son and seeing through world through his eyes.


Anastasia Keller-Collins, M.Ed., BCBA, LBA, CTRS


Anastasia is a Board Certified Behavior Analyst with a Masters Degree in Special Education, Severe Disabilities/Autism Specialization from the University of Hawaii at Manoa. She also completed her Bachelors of Arts in Recreation Therapy from San Francisco State University and is a Certified Therapeutic Recreation Specialist. She has a diverse and varied work experience that includes working with individuals with mental health issues, the aging, developmental and intellectual disabilities and autism in the clinical, home and community settings. In her spare time she enjoys making jewelry, working in the garden, exercising, or hanging out with her family and the pups!


Meredith Andrews, MMFT, BCBA, LBA


Meredith Andrews is Board Certified Behavior Analyst and is currently pursuing her Ph.D. in Applied Behavior Analysis through the Chicago School Of Professional Psychology. She obtained her Master’s Degree in Marriage and Family Therapy from Converse College in South Carolina. She also attended Converse for her B.A. in Psychology. Meredith has been working with children and young adults with autism since 2010. She is most passionate about training families and helping children generalize their skills at home and in their community. In her free time, Meredith likes to spend time with family, scuba dive, and hike.


Darren Olsen, M.A., RBT

Darren received his bachelor's degree in psychology at Arizona State University and his master's degree in Clinical Psychology from University of Hawaii. He is currently in the PhD program in Clinical Psychology at the University of Hawaii at Manoa. Darren also conducts emotional-behavioral assessments and therapy with youth at the Center for Cognitive Behavior Therapy. Prior to moving to Hawaii for school, he worked one on one with children with developmental disabilities for five years and also lived in Brazil for two years. Outside of work and school, Darren enjoys spending time with his family, volunteering with youth at his church, playing basketball, and going to the gym.


Marissa Ayala, B.A., RBT


Marissa is originally from Long Beach, California and obtained her B.A. is in Speech Pathology from California State University, Long Beach in 2012. She then worked as a Behavioral Therapist in Orange County, California before relocating to Oahu. Marissa has over two years’ experience in 1:1 ABA therapy in both clinical and at home therapy. Marissa was both peer and supervisor selected Therapist of the Year in 2013 in her previous behavioral therapy company. Marissa has a passion for making a difference and working with our kiddos. Marissa enjoys cooking, cleaning, going to the beach, and spending time with her family and friends.


Renee Wold, B.A., RBT


Renee received her bachelor’s degree in psychology from University of Hawaii at Manoa in 2014. She developed a passion for learning about and working with children while studying as an undergraduate research assistant in the Center for Cognitive Behavior Therapy under the supervision of Dr. Brad Nakamura. Prior to moving to Hawaii, Renee lived in Southern California and hopes to return and enroll in a doctorate program to pursue a degree in clinical psychology. In her spare time she enjoys hiking, dirt biking, rock climbing, scuba diving, attending concerts and playing with her dog.


Judith Ojukwu, B.S., RBT

Judith was born and raised on the north shore of Oahu, before relocating to the mainland. Judith received a B.S. in Psychology from The State University of New York at Stony Brook, in 2004. After her position as a family support worker, she developed a passion for children with developmental disabilities. Since 2007, Judith has worked as an Applied Behavioral Analyst (ABA) Therapist/Teacher, at private schools designed for children with ASD that focused on increasing appropriate social interactions and skill acquisition for children with autism. In 2011, she received an Advanced Certification degree in the field of Autism Spectrum Disorders, from Brooklyn College. Judith returned to Hawaii in 2014 and continues her passion to serve children with special needs. Her hobbies involve, spending time with family, hiking,reading, swimming, singing and dancing.


Vanessa Carter, B.A., RBT


Vanessa is originally from the Hamakua coast of Hawai`i Island, but was raised in Okinawa, Japan. She received her bachelor’s degree in English from the University of Hawaii at Manoa in 2011 and has recently completed an undergraduate speech language pathology program offered by the John A. Burns Medical School at UH Manoa. Vanessa will be pursuing a Master’s of Science in Communication Sciences and Disorders before becoming a licensed Speech Language Pathologist. In her spare time Vanessa enjoys weight training, watercolor painting, creating zentangles, and cooking.


Nicole Lehr, B.S., RBT


In 2011, Nicole earned a Bachelor of Science in Psychology from Virginia Polytechnic Institute and State University. After moving to Hawaii in 2014, she became a Registered Behavior Technician. She is currently working towards earning a Master of Arts in Applied Behavior Analysis with a focus on Autism from Ball State University, while working to become a Board Certified Behavior Analyst. Verbal behavior is a skill she is very interested in facilitating, and in particular she enjoys using play and social skills to strengthen communication in children. Prior to joining the BANKO team, Nicole worked with children diagnosed with ASD while implementing applied behavior analysis methods within home, school, and community settings. During her spare time, Nicole enjoys traveling, attempting to cook with her husband, and watching reruns of Gilmore Girls!


Reyna Aragon, B.A., RBT


Reyna Aragon is originally from Guatemala but moved to California when she was 12 years old. She received her B.A. in Psychology and Social Behavior from the University of California Irvine in 2013. She worked as a behavior technician in California for one year before she moved to Hawaii in January 2015. Reyna has been working as a skills trainer in Hawaii since. She became a registered behavior technician (RBT) at the end of 2015 because she loves working with children with developmental disabilities and wants to have as much knowledge as possible to be the best she can be at her job. Reyna is currently pursuing a master’s degree in Behavior Analysis from Arizona State University and hopes to become a BCBA soon. In her free time she enjoys doing jigsaw puzzles, playing mini-golf and going bowling. She also plays kickball for a military spouses’ league.


Celina Garces, M.A., RBT


Celina received her Bachelor's degree in Psychology from Hawaii Pacific University and earned her Master's degree in Counseling Psychology from Chaminade University. During her undergraduate years, Celina was a student athlete and played for the HPU women's softball team for four years. Celina has always had a passion to work with children and has been working with children with disabilities and special needs for the past 3 years. In her spare time, she enjoys playing sports, going to the beach, and hanging out with her family and friends.


Tammy Chang, B.A., RBT


Tammy was born and raised in Rochester Hills, Michigan and moved to Hawaii in 2002. After spending 15 years in Marketing Research, she returned to her original passion of working with children. Tammy quickly found her interests in ABA Therapy, and is excited to dedicate her future to serving children with special needs. Tammy has worked with children with autism for over a year, and is pursuing a BCABA licensure. She holds a Bachelor's of Arts in Psychology and an MBA in Marketing. In her spare time she surfs and trains Gracie Jiu-Jitsu in her family dojo.


Ky Vuong, M.S., RBT


Ky received his Bachelor's degree in Liberal Arts with a concentration in Behavioral Studies from Soka University in California, and earned his Master's Degree in Counseling Psychology from Chaminade University with concentration in School Counseling. He is a Hawaii Teacher Standard's Board Licensed School Counselor, and is currently enrolled in the Clinical Psychology Doctorate program at Argosy University. During his undergraduate years, he traveled and studied various coping styles and academic success of students in Indonesia, Japan and within Southern Orange County, California. Ky has spent the last few years working with students with learning disabilities, as well as studying the gamification of learning and the effects of Project Based Learning and motivation. In his spare time, he enjoys running, baking pastries, watching horror movies and playing video games.


Val Bocanegra, B.A.


Val was born and raised in Texas. She moved to Hawaii in December of 2015. She earned her Bachelor’s degree in Early Childhood Education from Our Lady of The Lake University. She also has a credential in Child Care Administration. She has worked within the classroom as a teacher in a private parochial school. She has also owned and operated a Child Care Learning Center in Texas. She has over 20 years’ experience working with children of all ages. In her free time she enjoys spending time with her family, hiking and arts and crafts.

Barley Walton, D.O.G.


Barley is a 5 year old English Cocker Spaniel and hails from the land down under. She has been a part of Behavior Analysis No Ka Oi, Inc. from its inception. Barley participates in social events with the children at the clinic and is our mascot. Barley enjoys swimming, getting her ears scratched, and running during her free time. She loves greenies and mummies homemade beef jerkey.


Fluffy, B.U.N.N.Y.


Fluffy (AKA "Buns") is a 4 month old Holland Lop Bunny. He enjoys hanging out with his BANKO friends and getting fed fresh veggies and hay.