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.

It is strongly recommended that international participants apply for visas at least 3 months prior to the Fall Meeting. Note: some consulates may have delays in scheduling visa interviews; therefore, applicants should first contact the consulate to determine the wait time for an interview. Additional information on business visas can be found at the DOS Business Visa Center website, and at the IVO website.

Also, if you are experiencing significant visa delays, please complete the visa survey, and a representative will provide feedback.

The U.S. Department of State maintains a comprehensive website containing information about traveling to the United States.

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

Letters of Invitation

If you did not submit an abstract and are in need of a letter of invitation, submit a request via this surveyIf you did submit an abstract to the Fall Meeting, do not submit a request to the link above and see below for further instructions. 

Please note, if you submitted an abstract, a letter of invitation will be automatically generated for you via the abstract submission tool in early October; do not submit a request via the above survey. If you are the presenting author on a submitted abstract for the 2014 Fall Meeting, please await your notification letter for a link to access this letter. If you have already generated a letter but you are in need of a signature on this letter, please know that a signature will be available on the letter in early October.

Otherwise, letters may be requested until 1 December 2014 via the survey and your request will be reviewed.