One of our roles is collaboration with staff to deliver the best instruction to our students. Our teaching and MLS degrees both prepare us in curriculum design and instruction, but librarians are uniquely qualified to help locate information and resources and instruct students in their use. Librarians spend a great deal of time preparing to be ready to collaborate at a moment's notice and to be up-to-date on curriculum and technology and trends.
See the ALA Infographic Working Together Is Working Smarter.
Librarians may help teachers prepare their instruction, may serve as co-instructors, or may instruct for the teacher when the lessons of the librarian and the teacher coincide. In fact, the librarian's lessons are aligned with most TEKS. This is the main reason librarians seek professional development at their professional conferences each year--in order to share with staff and students and be the movers and shakers that kids need them to be when administration allows them the support to be what we know we can be.