The origin of CECAM-IRL was an annual meeting of the atomistic and nanoscale simulators of Ireland, which held their 16th meeting in January 2012 gathering researchers from several institutions across Ireland, North and South. Their activities grew along side European sponsored initiatives, in particular, Ψk the electronic structure network focused mostly on solid state physics theory and computation, and SIMU and SimBioMa programmes, focused primarily on statistical mechanics and molecular simulation relevant molecular problems, soft- matter and biophysics. This led to Ireland becoming a CECAM member under the auspices of the Irish University Association, and becoming one of the found- ing nodes of the multi-nodal CECAM. Since 2007, 15 CECAM workshops and tutorials have been held in Ireland with the generous support in particular of Science Foundation Ireland, the European Science Foundation, and the Ψk network. One consequence of this collaboration has been the creation of an informal graduate school of nano-scale simulation. The interests of CECAM-IRL laboratories range from condensed matter to soft-matter, spintronics to rare-event methods and non-equilibrium statistical mechanics. Some of our future goals will be to strengthen our links with other very active communities using particle based methods such as plasma and astro-physics, food science, as well as statistical computer science and of course industry.