For Canada and Mexico citizens
The North American Free Trade Agreement (NAFTA) created special economic and trade relationships for the United States, Canada and Mexico. The TN nonimmigrant classification permits qualified Canadian and Mexican citizens to seek temporary entry into the United States to engage in business activities at a professional level.
Among the types of professionals who are eligible to seek admission as TN nonimmigrants are accountants, engineers, lawyers, pharmacists, scientists, and teachers. You may be eligible for TN nonimmigrant status, if:
You are a citizen of Canada or Mexico;
Your profession qualifies under the regulations;
The position in the United States requires a NAFTA professional;
You have a prearranged full-time or part-time job with a U.S. employer (but not self-employment - see documentation required below); and
You have the qualifications to practice in the profession in question.