As I posted in the other thread:

Masato is professor emeritus at Hitotsubashi University in Tokyo, it seems. There are quite a few people with the same name. This Wikipedia page (on a Japanese version of Auld Lang Syne) makes it clear which is the right one:

http://en.wikipedia.org/wiki/Aogeba_t%C5%8Dtoshi

I couldn't trace him using Hitotsubashi U's website. I have seen him listed as co-author of a few papers, but they aren't free to download and the abstracts don't give email addresses.

Perhaps it's time to use the Google People Finder?