If you are a Canadian citizen, you may enter the U.S. without a visa stamp simply by applying at the Port of Entry or Preflight Inspection Center.
If you are a Mexican citizen, you must apply for a TN visa stamp at a U.S. consulate prior to entering the U.S. in TN status.
Gather copies of required documentation, including:
Passport ID page evidencing your Mexican or Canadian citizenship
Professional license or certification (if applicable)
Evidence of academic qualifications, i.e., diploma (copy and original)
Employment letter. The letter should include the following:
Exact job title and corresponding profession as listed on the Approved list of TN Professions. (The list is found at http://www.nafta-sec-alena.org/en/view.aspx?x=343&mtpiID=147#Ap1603.D.1);
Detailed description of job duties;
Rate of pay, including benefits and any potential bonuses;
How long your services are required (not to exceed three years), with statement that employment is temporary;
How many hours you are expected to work (i.e. 40 hours/week)
Background establishing that Emory University is an existing institution, to include how long the institution has been in existence (e.g. since 1915), number of current employees (e.g. 16,837), and projected yearly gross income (e.g. $2.1 billion).
Mexican citizens will need a visa stamp. You must make an appointment at a U.S. consulate to receive your visa stamp. You should review the consulate website prior to your appointment to ensure you have all required documentation.