*Conference Director -IX Multicore World, Wellington, New Zealand. 18-20Feb2020

*Invited Speaker - Open Research: Rethinking Scientific Collaboration - Perimeter Institute for Theoretical Physics, Waterloo, Canada. 26-28March2018

*Speaker - 2nd What On Earth colloquium,Wellington, NZ. 6-7March2018

Speaker - 5th Computing for SKA, Auckland, New Zealand. 15-16Feb2018

*Session Co-Chair - IoT and HPC: will they work together? - SuperComputing17, Denver, USA. 15Nov2017

*Session Co-Chair - SKA: The Ultimate BigData Project - SC17, Denver, USA. 14Nov2017

* Keynote - 10th LatinAmerican HPC Conference, Buenos Aires, Argentina. Sept17

*Co-Chair IoT-HPC & SKA-BigData ISC17, Frankfurt, Germany. June17

*Invited Speaker - MVD FinTechForum, Montevideo, Uruguay. June17

*Speaker, "Migrating to Exascale Worldwide" -ISC16, Frankfurt, Germany. June16

*Invited Plenary Speaker-CHPC, Pretoria, South Africa. Dec15

*Towards an Open Software Stack for Exascale Computing. Convenor at SC15, Austin, USA. Nov15

*Speaker, SKA in Seoul, Korea, Nov15