It is imperative that authors and delegates allow sufficient time to obtain visas.
Information about United States visas can be found here. It is advisable to begin the application process as early as possible to avoid last minute problems. The time to obtain a visa can vary widely and has taken over three months for some individuals in the past. An interview at a consulate may also be required.
The US Department of Homeland Security has implemented the Electronic System for Travel Authorization (ESTA). ESTA is a new, fully automated electronic system for screening passengers before they begin travel to the United States under the Visa Waiver Program. ESTA applications may be submitted at any time prior to travel to the United States, and VWP travelers are encouraged to apply for authorization as soon as they begin to plan a trip to the United States.
Please note that ESTA has become mandatory for all travelers from current Visa Waiver Program member countries.
More information on this is forthcoming. Thank you for your patience with us.