sarah holton

Sarah Love — Director & Co-Founder

Sarah was born and raised in the four corners area. She was called into this work through the needs of a family member which turned into the beginning of PBS4C. Sarah’s fifteen plus years of experience in organizational management as well as her collaborations with local non-profit organizations was pivotal in the creation and expansion of PBS4C. Passionate and dedicated to building a thriving community for all people, Sarah strives to uplift others, to make a community stronger, more peaceful, and more inclusive. In her off time Sarah enjoys being outdoors with her two children.



Tonya Shangraw — PhD, BCBA-D, Clinical Director

Tonya is originally from Russia and lives in Alaska. Tonya got her BCBA-D certification in 2012 with a PhD in developmental psychology, offering a great perspective to help with better understanding of typical development and milestones. Tonya has been a Clinical Director for ABA agencies since 2013. Her areas of expertise include language and communication developments, functional assessments, play and social skills development, and working with problem behaviors. She enjoys using natural environment and items that are already in child’s natural environment. While working with clients and families she finds it especially important that all the goals are functional and make sense for the family.


Scotia Hammond — PhD, BCBA

Scotia is originally from South Florida and currently lives in Las Vegas, Nevada. Scotia earned her PhD in Special Education from the University of Nevada, Las Vegas. She is a board-certified behavior analyst and has extensive experience serving children and adolescents with autism spectrum disorder and emotional and behavioral disorders in the home, school, and clinic setting. She strives to create a client centered environment that embraces and values the strengths, culture, and opinion of each client. She focuses on creating a collaborative and supportive environment for every client to thrive. When not working, Scotia loves to travel, try new foods, and spend time with her cat, Muffin. 

Tania Isaman — MA, RBT

Tania has resided in the Cortez area most of her life. She loves travelling and adventure. Tania is passionate about getting her clients motivated and into the outdoors or the community to share the love of the outdoors with interested clients. Tania has a master’s degree in ABA and plans to become a BCBA. She received her Bachelors from Fort Lewis in Elementary Education. She has been working as an RBT for several years.

Brandee Muzzy — RBT Mentor, Administrator

Brandee is a Registered Behavior Technician with PBS of the 4 Corners. Her dedication and experience working with children with Autism is extensive. Her calmness and effective use of ABA therapy has been supportive and life changing with the children and families she works with. I am truly impressed with her compassion, flexible thinking skills, and her ability to effectively run behavior programs with our clients, families, and staff. Thanks so much Brandee!

Sherry Marcum PBS4C — Job Coach

She has worked successfully with with individuals with special needs for over 20 years. Her experience is seen in the amazing work she does with individuals with disabilities on and off the job. She has a diverse history of training and has worked in many settings with individuals with disabilities. Sherri will be acquiring her national supported employment certification this year. Thanks Sherry!

jacob tonna

Alex Ivery — RBT

Alex is originally from San Antonio, TX, but lived all over the world due to both parents being in the military.  She eventually landed in Colorado in 2000 and earned her license in therapeutic massage therapy.  She worked in higher education for six years working her way up from Admissions Representative to School Director then as a caregiver for approximately 10 years working privately with adults with varying disabilities including wheelchair dependent individuals, stroke survivors, and traumatic brain injuries.  Her compassion, patience, and creativity lend well to working with neurodivergent individuals.  She is currently working toward her Registered Behavior Technician credential, and enjoys traveling, learning about anything to do with holistic health and alternative living, camping, and creating music.  

kelli hallman

Kelli Holman — MA, BCBA

Kelli is a Colorado native currently living on the Western Slope. Her background in serving children began in Junior High when she was given the opportunity to help in a Middle School level 2 classroom. She quickly fell in love with the population and now has 18 years of professional experience working with children and their families in a variety of settings including residential, foster care, in-home services, and clinical care. Kelli earned her master’s in special education through ASU and have since used her experience and education to support behavioral change in children of all ages and abilities. She is passionate about providing care in a fun and supportive manner that emphasizes compassion and focuses on independence. In her spare time, she enjoys spending time with family as well as almost anything outdoors.


Amber Goldberg — RBT

Amber has as lived in the four corners area for 16 years. Amber served honorably in the Air Force for four years. Currently pursuing a degree in Psychology. A natural empath and loves to connect with and help people. Enjoys anything outdoors, animals, and being active. Thanks Amber!


Arnelda Hathale — RBT

Arnelda Hathale was born in Tuba City, AZ. but moved to Cortez, CO many years ago. Her empathy and inquisitive nature are a plus. She is a keen observer with loads of patience. Arnelda has experience in the hospitality industry so she understands the value and importance of our clients. The care and personal attention to each and every client’s need is of the utmost important to Arnelda. Our clients deserve it. Thanks Arnelda!

Zachary Siegel — BT 

Zach was born in the four corners and has always wanted to contribute to society in a meaningful way. He graduates from Fort Lewis College, CO, in 2023 with a major in biology and minor in philosophy. While Zach is intelligent and meticulous, he takes pride in having a creative imagination and child-like wonder. This, along with a great virtue of patience, has greatly aided in creating natural and fun sessions with adolescent clients.
bryanne goddard

BryAnne Goddard — RBT

BryAnne has lived in the area for over 20 years. She has worked with a variety of children over the past two decades as a teacher, director, and parent educator. She is passionate about helping all children live healthy and happy lives. In her spare time, BryAnne gardens as often as possible and enjoys spending time outdoors with her family.

Damian Howard — BT

Coming Soon!

Chris Cornell — BT

Coming Soon!
bryanne goddard

Stephanie Leon — BT 

Coming Soon!

Keesha Macaulay — BT

Coming Soon!