New U.S. Government Entry Requirement for Visa Waiver Program (VWP) Countries
Effective 20 January 2011 citizens of Visa Waiver countries will be unable to enter the United States without Electronic System for Travel Authorization (ESTA) approval from the U.S. Government. VWP travelers who have not obtained approval through ESTA will be denied boarding on any air carrier destined for the United States. For more information, visit the VWP program website.

Visa applicants from many countries must now apply 3–4 months in advance of their travel date. The U.S. Department of State maintains a comprehensive website containing information about traveling to the United States.

The National Academies website has additional information about visa-related issues and travel information for U.S. citizens and non-U.S. citizens.

Letters of Invitation

If you submit an abstract to the Fall Meeting  and live in a country other than the US or Canada, a letter of invitation will automatically be prepared for you. You will receive an e-mail, approximately 1 week after the abstract submission deadline, with instructions on accessing your letter of invitation electronically through the abstract submission site.

If you are not submitting an abstract to the Fall Meeting or live in the the US or Canada and require a letter of invitation, please complete the online questionnaire.