author
Best known for bibliographic work in philately, this little-documented writer is associated with a detailed early-20th-century index of stamp-collecting magazines. Surviving records suggest a careful compiler whose work was meant to help readers navigate specialist periodicals.

by William A. R. Jex Long
Project Gutenberg lists William A. R. Jex Long as an author connected with The Philatelic Index: Being an Alphabetical List of the Principal Articles Contained in a Selection of Some of the Best Known Philatelic Magazines in the English Language up to the End of 1904. That title points to a highly specialized interest in philately, the study and collection of postage stamps.
Reliable biographical information about him is scarce in the sources I could confirm here. Rather than appearing as a widely profiled literary figure, he seems to have been remembered chiefly for careful reference work: compiling and organizing information for collectors, researchers, and readers of philatelic journals.
Because so little verified personal detail is readily available, it is safest to view him as a niche author and bibliographer whose surviving reputation rests on making a specialist field more searchable and useful to others.