Another reason he turned it down was his disgust with the math community, after the debacle of "Shing-Tung Yau to downplay Perelman's role in the proof and play

Another reason he turned it down was his disgust with the math community, after the debacle of "Shing-Tung Yau to downplay Perelman's role in the proof and play up the work of Cao and Zhu". "I can't say I'm outraged. Other people do worse. Of course, there are many mathematicians who are more or less honest. But almost all of them are conformists. They are more or less honest, but they tolerate those who are not honest."