Say I have emailed a professor a few times, and told him I would like to work with him for my PhD etc. and that professor is interested:

How much of a factor could this possibly be in my application?

What about the (not so exact) opposite: somebody in the department doesn't like me, I apply there to work with somebody else etc.?

marked as duplicate by ff524 Jun 20 '16 at 2:11

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