Twice per year, the Walton Sustainability Solutions Initiatives invites informal science education professionals to become Sustainability in Science Museums Fellows. Approximately 20 Fellows from around the world participate in a weeklong intensive training, immersing themselves in sustainability instruction and activities from ASU scientists, faculty and staff. Although the fellowship is geared toward professionals from science centers and natural history museums, we also invite participants from other informal learning organizations, such as zoos, aquariums, nature centers, and other STEM-related informal education organizations.