 While at Loughborough, Moon completed the rigorous requirements of advancement to the highest level of honor, FLA, Fellow of the Library Association.He began his professional career running small libraries in Hertfordshire, at Finchley, at Brentford and Chiswick, and then at Kensington, experimenting with novel ideas in library service through this period.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.