A recent three-year study examined how school librarians and classroom teachers co-teach to facilitate learner-centered instruction, including inquiry and maker learning. The research team found that that co-teaching occurred through co-planning prior to and throughout the units. School librarians reported to have used various instructional methods such as scaffolding, modeling, mentoring, and coaching. Classroom teachers reported to have brought differing expertise as the content-area experts. The co-teaching relationships evolved over time, and the findings suggest school librarian-classroom teacher co-teaching significantly facilitates learner-centered instruction in schools.