Here is my version:
Dear Professor XXX,
I am writing you this letter because I would like to ask you for your support of my green card application as an “outstanding researcher” by writing a recommendation letter on my behalf. The evaluation of my scientific contributions by an internationally recognized and outstanding scientist like yourself is one of the major criteria for the US immigration office to decide about my case.
Currently, I am working as a XXXX at XXX in XXX. Before joining XXX, I was working as a postdoctoral research associate in the group of Prof. XXX at XXX in XXX, in the area of XX and XXX and the development XXX processes. During my Ph.D. studies with XXX at the University of XXX, XXX and XXX in XXX, I gained expertise in the area of XXX, especially in XXX. My scientific contributions have resulted in numerous publications in peer-reviewed journals, presentations and several awards.
During my stay at XXX I was impressed by the opportunities in the biotech community in XXX and decided to start my career in industry here in the United States. After more than one year with XXX, I now would like to apply for a green card which would provide me with an unlimited work permit.
I would like to ask you if you would be willing to write a recommendation letter on my behalf which I could send to the US immigration office. My company’s lawyer gave me a template how such a letter should look like since it is very different from a normal recommendation letter e.g. for a grant application. The main difference is that you would judge my scientific contributions as a whole (diploma and Ph.D. thesis, postdoc and industry research) based on my publications and CV. If you would decide to support my case I would send you this template together with PDF files of my most important publications.
I would very much appreciate your support of my green card application by writing a recommendation letter on my behalf. Please find attached my resume for your review.
I am very much looking forward to hearing from you.
Sincerely,
honkman