As the American Association of School Librarians (AASL) celebrates sixty-five years in 2016 as a division of the American Library Association (ALA), it is wholly appropriate to examine the life of the organization contemplating what the future holds for school librarians. It is important to understand the past and abiding certainty and steadfast adherence to a set of guiding principles, core values, and beliefs. This adherence to core values also explains why AASL is the standard-bearer and undisputed leader in the ongoing commitment to excellence in school librarianship and school library programs. This article presents and discusses: (1) What Are Professional Core Values?; (2) Core Values of Librarianship; and (3) Roots and Pioneers.