Become part of our movement to bring awareness, hope, and healingto families affected by SJIA (Systemic Juvenile Idiopathic Arthritis) and MAS (Macrophage Activation Syndrome). As a volunteer or advocate with the GP BOSSE 4 FOUNDATION , you can make a real and lasting impact in your community and beyond.

Help spread understanding of SJIA/MAS in your schools, neighborhoods, and local organizations. Stand beside families who are navigating new diagnoses, offer encouragement and connection, and be a source of compassion when it’s needed most.

Throughout the year, you’ll have opportunities to support our events, fundraisers, and awareness campaigns — each one helping us move closer to better treatments, stronger support networks, and ultimately, cures.

Every action matters. Every voice makes a difference. Together, we can shine a brighter light for all SJIA Tigers and their families.