Anyone applied in EB 1after chamging areas

I have a situation where I am considering applying in EB1. I have a PhD from a US university and started working in software after that. Since it is has become impossible to process EB3 within the 6yr H1 limit, I am thinking of giving EB1 a shot. Has anyone done this kind of a thing? Is there any implicit requirement that one has to be working in the area of the PhD to be eligible to file under EB1? Any advice would be appreciated.
Also, any advice on an attorney?

Thanks in advance

Seeking advice
 
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