I assume by "chinese professor at Harvard tried to steal the credit from Perelman", you mean the defamatory article written by The New Yorker regarding on Shing-Tung Yau. That accusatory article was written by an outsider with no regard to reality. For a correct account from within the mathematical community, see http://doctoryau.com/hamiltonletter.pdf.
While that may be true, there is no denying that Yau is a pretty divisive figure. He seems as interested in building his image in China and making the Chinese nation proud, than he is in doing real math. I can see why this attitude would rub some mathematicians the wrong way.
