Attendees » Visa

All foreign visitors desiring to enter the United States must have a valid passport. Depending on citizenship, the stability of that country and the duration and reasons for your stay, you may need to obtain a visa before coming to the United States.

Visitor Visa Requirements

The visitor visa is a type of nonimmigrant visa for persons desiring to enter the United States temporarily for business (B-1). For how-to-apply information, documentation requirements and more, please see this page.

Visa Waiver Program

All nationals and citizens of Visa Waiver Program (VWP) countries who plan to travel to the U.S. for temporary business or pleasure for 90 days or less will be required by law to obtain travel authorization prior to initiating travel to the United States. This authorization can be obtained online through the Electronic System for Travel Authorization (ESTA), a free Internet application administered by the U.S. Department of Homeland Security.

For additional information about the ESTA please visit

Travelers from countries not in the VWP are still required to obtain a Visa upon entry into the United States.

U.S. Embassies/Consulates

To locate the nearest U.S. Embassy or Consulate, please follow this link.

Visa Wait Times

Citizens of other countries must carry a valid passport and visa to enter the USA. Foreign participants should contact the United States Embassy, Consulate, or Office of Tourism in their home country as soon as possible to determine their particular visa requirements. Participants requiring visas must initiate the application process many months in advance of their departure date.

Conference Invitation Letter

If you need a letter confirming your participation in the MicroTAS 2020 Conference, please complete the Visa Letter Request Form. You must register for the MicroTAS 2020 Conference before the letter will be sent, with exception of confirmed speakers, authors, and advisors of an accepted paper.

If, for some reason, your visa application is denied, your registration fees will be refunded to you in full when appropriate documentation is given.