Why did it take Chatterji years to get his H1 visa and then his green card?

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They have already hit their quota this year so no one can get an H1 visa until 2013-14.

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After years of trying, he eventually received his H1 visa and then after an even more arduous process, he got his green card.

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It stipulates that you have to be a STEM graduate (Science Technology Engineering or Mathematics) with a valid visa within a year of graduation or with a H1-B Visa to qualify.

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He was permitted to stay on an H1-B visa, but it tied him to his employer.

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