This is pretty good: http://arstechnica.com/science/2012/07/epic-fraud-how-to-succeed-in-science-without-doing-any/
I do not know why Fujii did this, but from this article I suppose he did it for the money. That is, for the salary and grant money. It seems he was employed by two institutions at one point in his career. Legitimately employed, that is, as something like a visiting professor. - Jed
