A visit to the Keogh Collection today and meeting a lugubrious looking gentleman named Mahaffy. The name is familiar to me somehow though I do not know why? He looks elderly in this shot so I expect that it was taken in the decade or so before his death in 1919?
Among resources provided by today's contributors are the Wikipedia entry
for John Pentland Mahaffy (1839-1919). Best known as an academic and wit, Mahaffy was provost (the senior academic administrator) at Trinity. The consensus is that this image dates to perhaps a few years before his death in 1919....
Photographer: Brendan Keogh
Collection: Keogh Photographic Collection
Date: Unknown but probably c.1910-1919
NLI Ref: Ke 194
You can also view this image, and many thousands of others, on the NLI’s catalogue at catalogue.nli.ie
Owner: National Library of Ireland on The Commons
Source: Flickr Commons