The prison was designed by Sir Joshua Jebb and Frederick Clarendon and opened on its present site in 1848, to house military prisoners.
On his return to Britain, he was appointed Chairman of Directors and Surveyor-General of Prisons and Inspector-General of Military Prisons on 29 July 1863, succeeding Sir Joshua Jebb.
Joshua Jebb with Clarendon acting as executive architect, and Clarendon was also co-designer of the "Criminal Lunatic Asylum" in Dundrum two years later.
Mountjoy was designed by the British military engineering officer, Captain Joshua Jebb, Royal Engineers and opened in 1850, based on the design of London's Pentonville Prison also designed by Jebb.
The design was based on that of British prison engineer Joshua Jebb, and especially the designs for the Pentonville Model Prison in London (which suited the current prison reform theories at the time).
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