Short answers, pulled from the story.
John Davies of Hereford, born around 1565, was an Anglo-Welsh poet and writing-master. He appended "of Hereford" to his name specifically to distinguish himself from the contemporary poet Sir John Davies, who was born in 1569 and lived until 1626.
Davies wrote prolifically on theological and philosophical themes, and some of his work introduced proto-scientific ideas into public debate. He also produced satire, devotional verse, and epigrams about contemporaries including Elizabeth Cary.
His published works include Mirum in Modum (1602), Microcosmos (1603), Wittes Pilgrimage (c. 1605), Summa Totalis (1607), The Holy Roode (1609), The Scourge of Folly (1611), The Muse's Sacrifice (1612), and Wit's Bedlam (1617), among others.
Reverend Alexander Balloch Grosart, who lived from 1827 to 1899, compiled Davies's works into a two-volume edition printed in 1875 and 1878 at the Edinburgh University Press by Thomas and Archibald Constable. Only one hundred copies were produced as part of the Chertsey Worthies' library subscription series.
Brian Vickers argued in a 2007 monograph that Davies, not Shakespeare, wrote "A Lover's Complaint," which was published with Shakespeare's Sonnets in 1609. The attribution goes against scholarly consensus, and MacDonald P. Jackson called the omission of the poem from the 2007 RSC Shakespeare Complete Works a mistake, arguing that evidence for Davies's authorship is very meagre.
John Davies of Hereford died in London in July 1618.