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Sinann,  Thanks too for the link to the dissertation.  It is fairly recent and I've not seen it before.  Just glancing through it I see that prisoners were transferred from Mountjoy to Maryborough and it is likely that is why Bob's grandfather went there too.  Thanks again
Ellen

Hi

Welcome to Rootschat.  I think it is quite likely that your g-grandfather knew my father in law's family.  My fil and his brothers were all born in the early 1890s while he was at Mountjoy.  We know, from the prison correspondence register which is held at the Irish Record Office in Dublin, that he went to Maryborough after 1901.  By 1911 they were in Belfast and Robert was a trade warder at Crumlin Road.  They remained in Belfast after retirement and from there the 3 brothers all joined the British Army.  The prison cottages at both Mountjoy and Portlaiose have been demolished.  The Mountjoy cottages were demolished to build the women's prison. 
Records for prison staff are hard to access -  we were told (although it was a few years ago now) that there is only the correspondence register accessible for research.
I am guessing that you are in the States but  contact with http://www.nationalarchives.ie/ may be helpful.  Good luck with your research - Ellen

Thanks Shaun, I have got the pdf of that and is what I quoted from (the copy and paste from the pdf wasn't accurate! I knew that he served in the York & Lancs with my fil. As they were both born in 1896 they are long dead so can't ask them! 
Ellen

Hi, Good to hear from you.  I will check against my Wilmot tree later to see if it is up to date with your information.  I recognise some of what you have written.  My husband's half sister is Carilon Dene Wilmot, daughter of Gerald Cusack and my mother in law, Sheelagh.

With thanks, and best wishes, Ellen