What does it take to be a certified school librarian in TX?
Why does it matter in HISD?
Hold a master's degree from an institution of higher education that is accredited by an accrediting agency, as recognized by the Texas Higher Education Coordinating Board (outside source). Complete the required test. Have two years of classroom teaching experience in a public or accredited private school. (from https://tea.texas.gov/Texas_Educators/Certification/Additional_Certifications/Student_Services_Certificates/ )
School librarians are among the most well-educated teachers on any campus, and they have 2 years full time classroom teaching experience.