scan your passport, rp imp. pages as well as a letter establishing the link between you & the gentlemen & mail it to him. ask your friend to take print-outs of the same. he needs to secure a transit visa from the qatar mission in usa before embarking on the journey to doha. check on the internet about the places in usa where qatar has missions. he needs to go there in person & secure the transit visa. show the print-outs if asked. also he needs to tell the airline that preferably he will break journey for a day or two, whatever is max permissible by qatar law. worth trying. without a transit visa impossible!