target=_blank>http://www.businessinsider.com/yitang-zhangs-life-story-2015-6

target=_blank>http://annals.math.princeton.edu/2014/179-3/p07

target=_blank>http://www.wired.com/2013/05/twin-primes/

The last article explains best, I believe, to the lay people like me
about the over century old mystery in mathematics which was solved by a humble mathematician from China.

It isn't very clear about his trouble at Purdue University.
Having been a foreigner myself, I am more interested in his problem at Purdue.

Did "Professor T. T. Moh" try to exploit Zhang's work for his own use?
My guess is that when Zhang refused to give his work away to someone else (possibly Moh),
he got fired (they called it "Graduation") from Purdue and then Moh refused to give any recommendation,
creating the extreme difficulties he encountered in securing his job at other places.

Or, Zhang did not agree (or denounce) with "Moh's paper on Jacobian Conjecture"
which apparently had some deficit in it, as other scholars had pointed out.

Please read the article by T.T. Moh describing the life of Yitang Zhang at Purdue.
http://www.math.purdue.edu/~ttm/ZhangYt.pdf
Why did Moh write this article in the first place? Isn't this strange?
Make sure you read carefully, especially, between the lines (what he didn't say).
There are some strange tones or phrases in it.
It seems to be an excuse or justification of poor treatment on Zhang by Moh.

I am sure there are a lot of foreign students who got exploited by bad U.S. mentors
and have not seen the sunshines they deserve.
I wish there are more news or investigations about this event at Purdue.
This kind of things make my heart burning hot.

However, anyway, America (not Purdue) finally gave Zhang the blessing he deserves.
So, here, I say, "God Bless America !"

It is indeed very interesting, and I can see clearly what you are saying, WM.
Many of us, foreign graduates including myself have gone thru what he went thru.
As you said, when the credit or senior authorship of your original idea and work goes to your senior or mentor,
it is most upsetting, and at the same time it shows you clearly what kind of man or woman your mentor or senior is.
Quite recently my eldest son in his forties had similar experience although he was born here.
This happened even when I warned my son way ahead of the paper publication.
Somehow it made me upset more than my son who did not let me know until I specifically asked him what happened.
Certainly there is a jungle out there in academic world when it comes down to getting the credit for the originality.