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Foreign attendees will need to apply for a Visa at least 3 to 4 months in advance; CTF recommends applying for Visas as early as possible. Please check with your local U.S. consulate or embassy to find out the earliest possible application date.

Foreign attendees who may require a Visas for admission into the United States are directed to the following websites for information about U.S. visa policy and procedures:

• Board of International Scientific Officers, International Visitors Office
• U.S. Department of State, Bureau of Consular Affairs - Visa Services

Click HERE to download the General International Invitation Letter (PDF). This will be the letter used for all international attendees requesting an invitation from CTF to apply for Visa. Please email This e-mail address is being protected from spambots. You need JavaScript enabled to view it with the following information:

NAME
AFFILIATION/INSTITUTION
UNIVERSITY
ADDRESS 1
ADDRESS 2
CITY, STATE, ZIP/POSTAL CODE, COUNTRY

If you need to make changes to the invitation letter please specify the information in the email.