Moon was a trailblazer and influential figure instrumental in transforming library professionalism, polity, and social responsibility.

While at Loughborough, Moon completed the rigorous requirements of advancement to the highest level of honor, FLA, Fellow of the Library Association.

Frustrated with the conservatism of British librarianship, in 1958 he took a job as head of public libraries in Newfoundland, Canada, where he worked for one year.

Bowker company, Library Journal's publisher, saw in Moon a personality they hoped would revive the struggling magazine and take it in new directions.

Library Journal's fame dated back to the late 19th century with Melvil Dewey serving as its founding editor from 1876 to 1881.

In his nine years as editor-in-chief, Moon changed Library Journal substantially, most noticeably by engaging the magazine in controversial issues and taking sides in the heated debates that characterized American librarianship during the period.

With Moon at the helm, Library Journal earned consistent profits from advertising revenues and sweeping interest marked by an increase in circulation.

In 1969 he was hired as the chief editor of Scarecrow Press, a small publisher with ties to the library community that had recently been purchased by the Grolier Educational Corporation (now a subsidiary of Scholastic, Inc.), taking over for founder Ralph Shaw.

At Scarecrow, Moon rapidly increased the number of titles published per year, while introducing higher standards for editorial accuracy.

Events in the profession during his term made it difficult to arouse strong interest in this goal within the association, whose leaders mostly lacked prior experience in the policy arena to begin with.