GVBSC Leadership Team

Jessica Rosenberg-Mulvey, MA, BCBA, ECSE and Nathan Phillips are the co-owners of Grand Valley Behavior Services and Consulting (GVBSC) and are leading a shift in how behavioral health and educational support are understood and delivered in their community.

Together, they are challenging outdated, compliance-driven models by advancing a relationship-centered, trauma-informed approach that prioritizes assent, dignity, and real-world relevance. Their work integrates clinical expertise with systems-level strategy, bridging the gap between therapy, education, and everyday life.

Jessica is a Board Certified Behavior Analyst whose work spans early childhood through adolescence, with a focus on building interventions that grow with the individual. She brings advanced expertise in Practical Functional Assessment and Skills-Based Treatment (PFA/SBT) as a Level 6 trainer and Professional Crisis Management Instructor, helping redefine what high-quality, humane care looks like in practice.

Nathan drives the organizational vision, growth, and infrastructure of GVBSC, drawing on his leadership background with Wells Fargo and Vectra Bank to build systems that support both clinical excellence and long-term sustainability.

As partners in both life and leadership, they have built GVBSC as more than a service provider—it is a model for integrated, human-centered care. Their perspective is grounded in lived experience as a diverse, blended family raising neurodiverse and LGBTQ+ children, reinforcing their commitment to inclusion, authenticity, and meaningful change.

Chief Executive Officer

Jessica Rosenberg-Mulvey, MA, BCBA, ECSE

Jess is a Board Certified Behavior Analyst (BCBA), parent, and advocate with experience supporting children and adolescents across a wide range of developmental stages. While she brings deep expertise in early childhood development, her work spans school-age populations, with a focus on developmentally appropriate, evidence-based care that evolves with each individual and prioritizes connection, meaningful engagement, and dignity.

Jess's work is shaped by both professional and lived experience.

Over the past 18+ years, Jess has advocated within education and therapy systems while raising a diverse family of neurodiverse and neurotypical children. Her background includes roles as a BCBA, Developmental Interventionist, Montessori educator, and substitute teacher—experiences that inform her ability to bridge clinical best practices with real-world application.

Jess leads the clinical vision and development of services designed to move beyond traditional, compliance-based models. She is dedicated to building programs that integrate natural environments, family collaboration, and experiential learning to support confidence, independence, and long-term success.

Chief Operating Officer

Nathan Phillips

After graduating from Southern Utah University with a B.S. in theater and a minor in psychology, Nathan Phillips shifted focus and began his career in the banking industry as a mortgage salesperson, prior to serving a sales development consultant in Salt Lake City, Utah for Wells Fargo.

In 2011, Nathan advanced to the position of Wells Fargo Branch Manager for the Roaring Fork Valley in Colorado, prior to expanding his skill set as Vectra bank’s mortgage manager for the western slope of Colorado. Over the years, Nathan capitalized on opportunities to hone his skills as a team leader and expand his experience in strategic development, data analysis, and the management of day- to-day operations in a business.

Clinical Supervisor, ASD Specialist, PCM Instructor

Kassidy Hagerman, SBT certified

A Board Certified Behavior Analyst, Kassidy discovered her passion for Applied Behavior Analysis (ABA) working as a behavior technician for a behavior organization. With an unparalleled work ethic, Kassidy takes great pride in creating child focused, play-based therapeutic environments that enhance growth and development within a child’s life. Kassidy joined the Grand Valley Behavior team with a Bachelors degree in psychology (emphasis in counseling). Kassidy went on to receive a Masters degree in Applied Behavior Analysis with an emphasis in Autism Spectrum Disorder.

Kassidy was born and raised in Fruita, Colorado. In her free time, Kassidy enjoys hiking, playing basketball, and spending time with her husband and her dog Bear.

Clinical manager, RBT trainer, SBT AND PCM CERTIFIED

Kailey

Kailey is a dynamic, fun, and dedicated Clinical Manager and RBT Trainer on the Grand Valley Behavior team with over 7 years of experience working with neurodiverse children and their families. Kailey takes pride in her upbringing as a military brat, where she accessed a variety of experiences, in a multitude of places as a child. Prior to joining the Grand Valley Behavior team, Kailey worked as a registered behavior technician for a behavior clinic and as a developmental interventionist aide in an early intervention program. Kailey also has multiple early childhood courses under her belt.

Kailey's passion for working with children with special needs initially took root when she was in middle school, working as an aide in a special education classroom. Kailey’s first role as an aide was in 7th grade and she continued to support classmates with special needs in this capacity every year thereafter until high school graduation. Kailey’s passion grew deeper after having 2 children of her own with Autism Spectrum Disorder. In her free time, Kailey loves spending time with family and friends and her dog Willow.

Clinical Manager, RBT trainer, SBT and PCM certified

Ryan

Ryan is a Clinical Manager and RBT trainer with over 6 years of experience working with children with different needs. Ryan shares a calm, patient, and lighthearted presence to those he works with and brings a sweet tranquility to our Grand Valley Behavior team. Ryan joins the Grand Valley Behavior with experience working in early intervention as a registered behavior technician for a behavior clinic and with young children as a paraprofessional at the Summit school. Ryan was born in Missoula Montana and has a degree in Natural Resource Conservation.

Ryan loves spending time outdoors climbing, hiking, and exploring and, in his free time, Ryan can be found spending time with friends, exploring new areas of Colorado.