Probably not a colleague of Ryan Duns, SJ.
This is "an ancient Irish ballad, which was written a few years ago" by Tom Lehrer. He goes on to explain that:
This type of song also has, what is known technically in music as, a "modal tune," which means -- for the benefit of any layman who may have wandered in this evening -- that I play a wrong note every now and then..Furthermore, Lehrer asserted it wasn't really a genuine folk ballad because
This song though does differ strikingly from the genuine folk ballad in that in this song the words which are supposed to rhyme - actually do.
[...]is replete with all the accoutrements of this art form. In particular, it
has a sort of idiotic refrain, in this case "ricketty-ticketty-tin" which you'll notice cropping up from time to time, running through, I might add, interminable verses. The large number of verses being a feature expressly designed to please the true devotees.