The Resources Management Division and Fire Management Branch at Yosemite National Park have collaborated to develop a Resource Advisor (READ) on-call system in order to better ensure that resources issues are addressed during prescribed and wildland fire incidents. This paper describes the system developed for READ callout, challenges, and the lessons learned through time. During the 2003 fire season, READ presence on incidents in Yosemite addressed issues such as vehicles within wilderness boundaries, protection of rare and endangered plant species, education regarding invasive plants, cultural resource protection, and retention of snags for wildlife habitat. At the same time, the READ position advocated on behalf of both the Resources Division and Fire Management for the return of fire to its natural role in the Sierran ecosystem.