I worked with North America Immigration Law Group for almost one and a half years starting from May 2018. They have been helping me with EB1A and NIW petitions. I got my NIW I-140 petition approved yesterday. We submitted it in March 2019 and It only took 7 months! Although the "Form B" date of EB2 is back to 2016, I still love it!! Their service is beyond excellence. Super prompting response to my question on a well designed online platform within a one-day time period all the time. I can guarantee you that you can not get this from any other immigration law group (join some Green Card discussion WeChat groups and check if I am correct. I'm in three 500 people groups), convenient telephone communication with the attorney by appointment, plus unlimited discussion on the petition letter, reference letter, and anything related to your I-140 and -485. I sent them hundreds of questions and every one of them was professionally addressed. Furthermore, they are the only law firm that has big data about EB1 and NIW petitions due to the huge quantity of petitions they handled. Therefore, they can give you a big picture of EB1 and NIW and predict some important trends. I was fortunate to have been given their Approval/Refund Service. My first EB1A petition was submitted in Jan 2019 with PP and later withdrawn because the Immigration Officer required 1000+ citations. If you are familiar with EB1A, you know what I'm talking about "杀手". They fulfilled their promise in the Approval/Refund Service and paid for the I-140 petition fee for my second submission. I was very satisfied with their service and I have already paid for the I-485 preparation fee for my wife and myself simply because they are professional and trustworthy. As my conclusion, I strongly suggest you contact them and get a free evaluation ASAP. The good thing will start from there. I wish every Chinese high skilled professional can get the Green Card hassle-free, and good luck to you all and myself!!!