From 1959, the library implemented many of the changes suggested in the reports. In 1962, the first full-time African-American library staff member, Edward Walker, was hired as a mail clerk first class (he would retire in 1992 as the bookstack supervisor). The following year, librarians were raised to professional faculty status. After 25 years of service, Harlan Brown resigned as Director of the Library on September 1, 1964 for reasons of health, and was succeeded by Isaac Thomas Littleton (born 1921) as acting Director; Brown would continue as associate Director until his retirement as Director Emeritus on July 1, 1971. Maurice Toler became the first professional University Archivist in 1965, the same year library holdings passed 300,000 volumes and the library was air-conditioned. Owing to the rapid expansion of both the university and the library, the new library building was outgrown a decade after it had opened. Littleton and the library staff proposed a 110,000 square-foot bookstack addition to the original building, renovation of the existing building to house offices and reference and research functions and converting the Erdahl-Cloyd Student Union into an undergraduate library. Odell Associates, Inc. was selected as the architectural firm, and $2.483 million was initially appropriated for construction by the 1967 General Assembly, with additional state funds being approved in April 1968.