I used Chen Immigration Law firm for my EB2-NIW application. I want to thank them for the approval of my application. I started working with them in November 2020. They evaluated my profile and offered me approval/refund service. The retention process was smooth and they started working on my case immediately. After I provided them with my research summary/list of recommenders they prepared all the recommendation and petition letters. They always provided me the letters at the 10 day-mark as they promised. The letters were high-quality and custom-made to highlight my achievements. They were prompt to make any reasonable edits to the letter within a short time. Additionally, while I was preparing the documents, I had a lot of questions and they always answered my query within 24 hours (as they promised). Overall, I am happy with their service and I would recommend their service to anyone who is aspiring to apply for EB-1/EB2-NIW/O1 visa. Thanks, Chen Immigration team and keep up the good work.