I am Peter Roberts, an immigration lawyer who does work for YC and startups. AMA
DO NOT WORK WITH HIM. Can't believe he made it to HN!!
He somehow became a thing but I can't stress out enough how much money he had cost me while providing either no service -even declined to work on my first case- or really shitty service, where i ended up writing all docs myself. 
He does not think out of the box at all or provides any value bigger than digging into Google. He didn't have any plan B or even replied to my emails asking what we should try next after we had lost. The only thing he ever did for me was sending the invoice. Everything else was taken care of by his assistant, sending information and documents i had drafted to the government, trying things that i had researched myself.
Please feel free to reach out to me for a curated list of good immigration lawyers. I would have taken my return flight back to Germany more than a year ago if i listened to his advice, which has been "i don't see any options here" when there WAS an option for another year.