[m_mueller]

Maybe you mean Matsuoka sensei? He's the director of RIKEN AICS since a couple of years and a known media figure in Japan.

[jabl]

Satoshi Matsuoka is an "international rock star" in HPC circles. But I don't think he was involved with the K computer; before RIKEN he was IIRC at Tokyo Tech doing their "Tsubame" GPU clusters.

[m_mueller]

Yes, but I've seen a talk of him where he also mentions K, so maybe that's what GP meant.

Edit: Btw. I did my PhD at Tokyo Tech (not with Matsuoka though) ;-)