Vivek Wadhwa has done a ton of research on women and immigrant entrepreneurs. I met and spoke with him before a recent talk he was about to give about how immigrants lead the ranks of Silicon Valley entrepreneurs. I made it into his presentation. You can check it out here: Vivek Wadhwa -- Immigration
I expand on my point to him that what we consider "unskilled immigrants" may not be so unskilled in an article for Fast Company.