About collective impact solutions
What drives us:
At Collective Impact Solutions (CIS), we believe in creating lasting change by working together to remove barriers and fix unfair systems. We focus on changing policies and practices that have held people back, especially in communities affected by racism and inequality.
We use the Single System of Support Framework (SSoSF), which combines research and real-life experiences to design solutions that meet each community’s unique needs. Our team includes experts from all levels—local, state, and national—who bring the best practices to help create change.
Working Together
We believe real change happens when we all work together in trust and partnership. We make sure that everyone—nonprofits, schools, governments, and communities—works toward the same goals. By aligning efforts, we build strong plans that deliver real results for the people we serve.
At CIS, we are driven by the idea that we can make systems fairer and create better opportunities for everyone through collaboration and shared commitment.
Our Team
Dr. Rebecca Celes Mendiola, CEO & Co-Founder 25+ Years Transforming Systems From Within and Beyond
Dr. Rebecca Celes Mendiola, CEO & Co-Founder 25+ Years Transforming Systems From Within and Beyond
Dr. Mendiola didn't just study systemic change, she lived it. After 23 years leading transformation efforts as an Assistant Superintendent, Director, and Coordinator across multiple school districts, she made a strategic decision: systems change faster when pushed from the outside with inside knowledge.
Her Unique Perspective:
- Co-founder of the California PBIS Coalition
- Established and directed PBIS Technical Assistance Centers in Santa Clara and San Diego Counties
- Led multiple student services departments ensuring equitable access for all students
- Expert in Mental Health, Behavior Intervention, and System Coordination
"I spent decades working within government systems. Now I use that insider knowledge to help communities navigate those same systems more effectively. The difference is night and day when communities have someone who truly understands how government works."
Mirna Castro, Director of Operations & Projects 22+ Years Bridging Public and Nonprofit Sectors
Dr. Rebecca Celes Mendiola, CEO & Co-Founder 25+ Years Transforming Systems From Within and Beyond
Born and raised in the San Joaquin Valley, Mirna brings rare dual expertise in government operations and nonprofit strategy. Her 6 years in human services and public health, combined with 16+ years in nonprofit leadership, creates unique insight into what actually works on both sides of the partnership equation.
Her Strategic Value:
- Deep government experience in human services and public health
- 16+ years in nonprofit direct service, advocacy, and management
- Bachelor's in accounting with nonprofit concentration
- Proven track record in operations, client service, and organizational development
Puri Celes-Mendiola, Administrative Assistant
Puri graduated with an Associates degree in Psychology from San Deigo Mesa College. She is currently attending San Diego State University for her Bachelor's degree in Psychology with a minor in Social Work. Puri has experience working with children with Autism as an Applied Behavior Technician and three years experience in retail.
Leaders in the field: OUR CONSULTANTS
CIS is supported by recognized leaders across sectors who provide strategic guidance and enhance our credibility. This network offers cutting-edge research, broadens our reach and brings diverse perspectives that strengthen every client engagement.
Art Casillas - Applied Behavior Analysis & PBIS
Dr. Cha See - Evaluation & Strategic Learning partner
Christi Tapia - Positive Behavior Analysis & PBIS
Dr. Christina Arpante - Education & Communications
Fred Buggs - Youth Development & Expanded Learning
Dr. Kim Yanek - PBIS, Mental Health, MTSS Research
Patricia Marquez Singh- Restorative Practice & Bullying Prevention
Rainbow Crane Walker - PBIS & Mental Health
Susan Barrett - PBIS, Mental Health, MTSS, research
Tia Martinez - Life Course Framework, Youth Justice, Racial Equity
Tiffany Gipson - Health Equity Strategist & Systems