[Oztrich Boy]

There was a PBS "history detective show" that tracked this work to another man,

Major Henry Livingston

The matter is confused by the fact there were two Santa Claus poems in the 1820s.
The probable Moore Old Santeclaus (1821) and A Visit from St Nicholas (1823).

The latter was more popular than the mean-spirited Old Santeclaus and with Livingstone dead c.1830, the authorship was assigned by rumour to the more prominent Moore.
Moore chose not to dispute this and later included VFSN in a book of Christmas poetry without actually claimng he wrote it.

[Oztrich Boy]

Yet another Moore From Saint Nicholas showing a similarity of theme to Old Santeclaus and unlike The Night Before Christmas

[q_an_a]

thank you for your enlightened links and post. Merry Christmas to you and yours.