The Traditional Ballad Index has no information on the poem's author, Kevin T. Buggy.

Justin McCarthy's multivolume anthology "Irish Literature" (1904) says this:

"KEVIN T. BUGGY [1826-1843] is chiefly known by the popular poem printed here, The Saxon Shilling,' which appeared in January, 1843. He was a son of Michael Buggy of Kilkenny, where he was born in 1816. He was called to the bar in London in 1841, and later succeeded Sir C. G. Duffy as editor of The Belfast Vindicator. He wrote some stories and poems for Irish newspapers, which were never collected or republished. He died in Belfast, Aug. 18, 1843, and a monument was erected over his grave by means of a public subscription.

"He is described as a “rough, unkempt, slovenly, hearty kind of man and of great ability.”