Excellent responses. Thank you. I would add that the O-1 and the E-2 are probably the best fits to do consulting work for multiple companies in the U.S. but the O-1 requires a relatively high level of achievement and the E-2 requires a "substantial" investment by (in this case) Canadian citizens (which can include investments by you) or Canadian-owned companies and a business plan that shows the hiring of U.S. workers (citizens and permanent residents) over time.