CASA of Mariposa County


Meet Our Staff

Monica Martinez

CASA Program Director

Monica Martinez is honored to serve as the Program Director for CASA of Mariposa County. She began her work 4 years ago and has continued to be actively involved in the development and growth of CASA’s programs. Monica started on the team that created the RECESS program from the ground up. Her passion to support children and their families helped RECESS to grow into a dynamic, successful resource for the Mariposa community. Her persistence and work ethic lead to a promotion as CASA’s Program Coordinator. In this role, Monica combined her knowledge of the needs of families with advocating for children in Mariposa’s foster and delinquency systems. Working with Volunteer Advocates, community partners, and children in foster care strengthened her sense of commitment to provide quality, direct services to the youth CASA supports. Now as CASA’s Program Director, Monica is using her wisdom and experiences to instill these values in all of CASA’s programs.  Monica resides in Mariposa with her husband and four children. She counts her children among her greatest accomplishments.  Monica enjoys spending quality time with her family, whether it be at sporting events with her kids or enjoying a nice day out and about in beautiful Mariposa. She is excited about the work that CASA is doing and is looking forward to innovations and progress yet to come.


Amber Wanner

CASA Program Specialist

Amber Wanner, CASA Program Specialist, started her journey with CASA as a Volunteer Advocate. Prior to this, she worked for the Mariposa School District Special Education services for 13 years. It was clear to her that she had a desire to make a positive impact on children’s lives. When she had the opportunity to join the CASA team as a Program Specialist, she quickly accepted.  Amber is committed to finding the best Advocates for the children of Mariposa County. She provides top-quality training and ongoing support for CASA’s Volunteer Advocates. Amber helps volunteers in their efforts to be a voice for the children in Mariposa’s foster and delinquency systems.  Her drive to provide the best support for those she works with doesn’t stop there. As a mother of two children, Amber is dedicated to her role as Mom above all. Growing up in Mariposa, the importance of community involvement was instilled in her at a young age. Hoping to pass these values on to her children, you will find Amber behind the scenes at many events throughout the community.  Never afraid to talk to a friendly face, she will definitely share all of this and more with you if you happen to find yourself in her company.  


Christina Aguirre

RECESS Program Specialist

Christina Aguirre is a CASA Program Specialist here at CASA of Mariposa County. Christina came to CASA from Social Vocational Services where she worked as a case manager for adults with special needs. She has a passion for helping others grow and thrive within the community. This translated well to her position here at CASA where she is constantly seeking the best ways to help families and children. Her efforts are focused on building our group of volunteers by bringing in people who can make a huge difference in a child’s life. Her passion spreads through the community through her volunteer recruitment efforts on social media and other platforms, she really enjoys interacting with the community to build relationships with volunteer advocates.
Christina is an animal lover as well. She has two dogs, two cats, and two chickens who all live with her. Christina enjoys making others laugh and spreads joy wherever she goes. She always has a smile on her face and people feel comfortable around her. She moved to the area from Visalia in 2016 and has been an active member of the community since arriving in march of that year. Christina hopes to continue serving the community in many ways. Feel free to reach out to her if you want to volunteer for CASA.


Summer Keiki 

RECESS Program Specialist

Summer Keiki is a RECESS Program Specialist at CASA of Mariposa CountySummer has a professional background and degree in Early Childhood Education, she has worked with children and families for over 10 years. Her passion is educating and advocating for children and their families in ways that meet their individualized needs. Having served very under privileged communities solidified to her, that there is such a need for dedicated individuals to provide services, and pair families with resources to empower and enable them in reaching their goals. This is where Summer truly finds meaning in her work. Summer enjoys spending time with her family, especially her four children and three grandchildren who are her greatest joys. She loves reading and being a life long learner because she believes the greatest power resides in knowledge. She spends great deal of her time promoting literacy to young children and parents to encourage a strong foundation for learning. She has a love of music, arts, and in her spare time she and her family enjoy to visit the Mariposa/Oakhurst/Yosemite area enjoying the beautiful outdoors. She is driven and committed to making a difference in the lives of the children and families she serves and is very excited to have a platform such as CASA of Mariposa that allows her to continue effecting positive change in the lives of others.




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