The Every Student Succeeds Act (ESSA) has created additional opportunities for school librarians to collaborate with classroom teachers, reading specialists, and other educators in support of schools' literacy goals. This potential for expanded collaboration suggests a need for increased focus on reading instruction as part of the school librarian's workload. For a variety of reasons, school librarians may not see this role as a priority within the scope of their many other duties. This convergent mixed-methods study sought to examine the effect of a professional development series emphasizing reading comprehension strategies on school librarians' knowledge and perceptions. Results indicated that participants experienced statistically significant knowledge gains as well as increased acceptance of an enhanced role in literacy instruction.