International Travelers' Assistance

Visas

U.S. visa policy permits citizens of certain countries to travel to the U.S. without a visa, when they meet certain requirements, under U.S. laws. For information, visit the Visa Waiver Program website.

If you live in a country that requires a visa to visit the Unites States, please review the helpful information on the following websites:

• U.S. Department of State Visitor Visa.
• The National Academy of Science International Visitors Office - specifically designed for scientists traveling to the US.

If you need a Visa we urge to apply for one as early as possible.

• Apply at the appropriate location at least 5 months before intended travel.
• Check on-line for the wait times for appointments.
• Be accurate and specific in completing your application. Avoid mistakes. If needed, attach an explanation letter.
• Attach evidence of your previous visits to the United States.
• Attach evidence of your intended return trip to your home country.
• Acquire a police clearance, if possible.
• Bring all documentation proving your home country connections. Suggestions include:
• past visas
• bank accounts
• family
• professional position
• home ownership
• marriage license
• If appropriate, bring copies of correspondence confirming you are
• presenting a paper 
• speaking at the meeting
• receiving and award or grant
• Bring your letter of invitation from AACC.

Entry to the U.S.

• Homeland Security Entry Process.
• U.S Customs and Border Protection Entry Process

Be prepared to allow inkless fingerprinting and digital photographs upon entry to the U.S.