Megan Merrell, PHD & BCBA-D
Clinical Director
Dr. Merrell's experience in behavior analysis began in 2003 when she started working as a
home-based behavior interventionist. She developed a quick love for the children she served
and the steady progress they demonstrated, due in part to their ABA services. It inspired
her to pursue a long-term career as a Board Certified Behavior Analyst, which she obtained
in 2012.
Dr. Merrell earned a bachelor's degree in Audiology and Speech-Language Pathology
from Brigham Young University (2008), a master's degree in Applied Behavior Science
(2011) and a PhD in Behavioral Psychology (2013), both from the University of
Kansas.
Throughout her graduate school career, Dr. Merrell gained clinical and supervisory
experience at residential, center-based, home-based, and university-based programs.
After earning her PhD, Dr. Merrell gained 10 years of experience as a clinical
director in Southern California. During that time, she helped ensure hundreds of
learners received access to quality care, and she had the honor of mentoring over 65
BCBAs and aspiring BCBAs.
Dr. Merrell has experience working with children, teenagers, and young adults with
varying diagnoses. She is passionate about providing high quality, evidence-based
services. In addition, she has love for teaching and mentorship. She takes pride in
developing meaningful relationships with her team and in helping strengthen their
clinical, professional, and supervisory repertoires.
Dr. Merrell joined Possibilities as their St. George clinical director in 2024.
Joining Possibilities allowed her to move to the beautiful area her family calls
home. Dr. Merrell, her husband, and her 5 sons are thrilled to establish roots in
the St. George area.
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Karissa Wittwer
Center Manager/Care Coordinator
Karissa is from the sunny city of St. George Utah. She has dedicated the past five years to working with children with autism. This endeavor has become more than just a job; it has become her passion. Witnessing the transformative power of love, patience, and understanding in these young lives has been her most fulfilling experience. Every day, she strives to create a nurturing and inclusive environment where these exceptional children can thrive and reach their full potential. Her unwavering commitment to making a positive impact on the lives of these chidlren has fueled her desire to continually learn and grow in this field. READ MORE
Nikki Clyde
Behavior Analyst
Nikki (Nichole) Clyde is a dedicated Registered Behavior Technician (RBT) who embarked on a transformative journey after becoming a mother. Her passion for family and travel continues to be her guiding light. Nikki holds a double bachelor's degree in mild/moderate Special Education and Elementary Education from Southern Utah University and later earned a master's degree in Severe and Profound Disabilities from the University of Utah. It was her personal experience as a mother that led Nikki to change her career path, driven by a newfound passion for understanding autism from a family perspective. With eight years of experience as a devoted teacherand her personal journey as a mother, Nikki is committed to furthering her knowledge and making a positive impact on the lives of individuals with autism and their families. Her ultimate goal is to become a Board Certified Behavior Analyst (BCBA) to bridge the gap between education and family support. Nikki finds fulfillment in each moment shared with her family, and her career change reflects her unwavering dedication to the autism community. READ MORE
Devin Guinn
Behavior Analyst
Devin Guinn has been working in the field of Applied Behavior Analysis since 2018. She received her Bachelor's Degree in Behavioral Science and a Master's Degree in Education with an emphasis in Behavior Analysis from Utah Valley University. Devin has always had a passion for working with young children and teaching through play. Early on in Devin's career, she received extensive training in naturalistic therapy strategies and using play and motivation to teach a wide variety of skills. Devin is passionate about creating inclusive environments in the community for all children, and has experience with collaborating with many different professionals to enable autistic children to access more environments in the community. Devin currently lives in Utah County and enjoys hiking and spending time with her nieces and nephews. READ MORE
Kristen Hoover
Behavior Analyst
Kristen Hoover is a dedicated and experienced professional in the field of Applied Behavior Analysis (ABA). She holds a Bachelor's degree in Liberal Arts with an emphasis on Sports Medicine and Exercise Science from California Lutheran University, and a Master of Arts in Teaching with a focus on Applied Behavior Analysis. Since entering the field of ABA in 2009, Kristen has accumulated over a decade of hands-on experience and has been a Board Certified Behavior Analyst (BCBA) for 12 years. Her extensive background and expertise have enabled her to make significant contributions to the ABA community, helping numerous individuals improve their lives through effective behavioral interventions. Born and raised in Southern California, Kristen has always had a passion for learning, animals, and nature. She is passionate about applying evidence-based practices to support individuals with diverse needs. Her commitment to continuous learning and professional development ensures she stays at the forefront of advancements in the field. Kristen's work is characterized by her dedication to ethical practice, compassionate care, and a strong emphasis on client-centered approaches. READ MORE
Jacob Hillman
Behavior Analyst
Jacob has been working in the field of ABA since 2010. He has a wide range of experience and a genuine passion for making a positive impact. He received a Bachelor's Degree in Psychology from Utah State University and a Master's Degree in Behavior Analysis from the University of Houston - Clear Lake. His expertise spans a spectrum of key areas, including behavior assessment, severe behavior, verbal behavior, individualized treatment, and caregiver training. Jacob's commitment to tailoring interventions to meet the unique needs of individuals reflects his dedication to promoting independence and growth. With over a decade of hands-on experience, Jacob is well-versed in effective teaching methods, ensuring that learning is not only impactful but also personalized. He is delighted to have found a professional home that shares his values, providing him with a platform to contribute meaningfully to the lives of those he servces. Jacob remains a steadfast advocate for individualized care, providing unwavering support to inspire positive change and foster the development of crucial life skills. His approach combines professionalism with a genuine desire to make a meaningful difference in the lives of others. READ MORE
Sarah Sargeant, BCBA
Behavior Analyst
Sarah Sargeant has been working in the field of Applied Behavior Analysis for over 8 years. She earned her Bachelor's degree in Linguistics from Stony Brook University in 2015; she has always been passionate about the importance of language and effective communication. Soon after, and while she worked as a Registered Behavior Technician, she pursued graduate coursework from the Florida Institute of Technology and obtained her Board Certification as an Assistant Behavior Analyst in 2017. In 2018, she completed her Master's degree in Exceptional Student Education/ABA from the University of West Florida and has been a BCBA since that same year. Sarah has substantial experience working with a variety of learners and their caregivers across settings to include, clinic, home, school and in the community. Sarah thoroughly enjoys collaborating with others, working as a team and believes that this is the key to progress and achieving goals. Sarah is excited to be part of the Possibilities team to deliver compassionate, individualized care to all learners and their families! READ MORE
Maddi Van De Bussche
Behavior Analyst
Madeline's (Maddi's) journey into Applied Behavior Analysis began post-Covid when she joined a preschool committed to inclusive education. Transitioning from career uncertainty to a focus on ABA and early intervention, she conducted research in PCIT and earned a bachelor's degree in Psychology with a minor in Communication from West Virginia University. Relocating to Utah in May 2022, Maddi assumed the role of a Registered Behavior Technician (RBT) and is currently pursuing a master's degree at Arizona State University with the goal of becoming a Board Certified Behavior Analyst. READ MORE
Trevor Stookey
Clinical Coach
Trevor has been working in the field of ABA since July of 2020. After gaining experience from centers across Utah and Arizona, Trevor has discovered that the best approach to ABA is the emphasis of compassionate therapy. As Clinical Coach, Trevor provides support to other technicians by ensuring successful implementation of programs, assisting in the connecting to learners, and helping Behavior Analysts with assessments and quality of care. Trevor loves connecting with each and every learner by finding fun approaches to ensure their success. In his free time, Trevor enjoys playing board games with his family, spending time at the lake, and going to the movies with his friends. READ MORE
Sally Hamm
RBT Training Specialist
Sally began working as a Registered Behavior Technician in 2016 and instantly fell in love with the field of ABA. Through working with individuals of all ages on the Autism spectrum, she found her passion in working with non-verbal, high behavior children. She finds it life changing (not only for the child, but also their families) to teach a child that their words hold meaning. Sally Joined Possibilities in 2023 and soon after became the Training Specialist, overseeing a team of competent trainers. Within this role she has been able to help others find the love she has for the field and ensure that the learners at Possibilities have the highest quality of care. READ MORE
Brooke Mangis
Pod Lead
Megan Stucki
Pod Lead
Savannah Dunn
Behavior Technician
Reilly Monson
Behavior Technician
Paige Utley
Behavior Technician