There are many wonderful organizations out there doing important beaver-focused work. Here are just a few:
The California Process Based Restoration Network : A diverse collaborative of natural resource professionals with a shared mission to promote and advance process-based restoration approaches to increase the capacity of degraded river and stream ecosystems to retain water, support biodiversity, create fire resiliency, and adapt to climate change.
Beaver Institute: A national nonprofit which works to support beaver management, coexistence, communication, education, and scientific research.
Occidental Arts & Ecology Center WATER Institute: Engages in projects and collaborations to empower environmental stewardship, preserve biodiversity, develop resiliency to climate change and improve watershed health. Check out their new statewide Beaver Coexistence Training and Support Program!