Speaker of the House of Keys and the most productive Manx scholar of his generation.

He was of Cronkbourne, and took his degree at Trinity College, Cambridge. His title pages give both, and by 1900 they give the Speakership as well.

The books came steadily. Manx Surnames and Place-Names was followed by The Folk-Lore of the Isle of Man, which he dated from Cronkbourne in June 1891 and offered as a contribution, though an insignificant one, to the science of folklore. Sodor and Man appeared in 1893 in the Diocesan Histories series for the Society for Promoting Christian Knowledge. A History of the Isle of Man came out in two volumes in 1900. The Story of the Isle of Man, a school book, followed in 1901, sent out in the hope that its little readers would find it useful and interesting and that it might increase their love for their native land. He also compiled Manx Worthies.

He worked in the smaller forms too. He contributed a paper on water and well worship in the Isle of Man to volume five of Folk-lore, describing the ritual at half a dozen named wells, where the patient walked round sunwise, drank, and wetted a fragment of clothing. He catalogued a document of 1379 preserved at Knowsley Hall for the Transactions of the Isle of Man Natural History and Antiquarian Society in 1898. He kept the rainfall gauge at Cronkbourne and signed off the Island's annual rainfall returns in the 1880s.

Later collectors treat him as the baseline. W. W. Gill sets his own place-name notes against Moore's, marks where Moore could not locate a name, and records where Moore's enquiries had failed.