>Sorry, you’re not allowed entry to the US on your ESTA.
"ESTA" stands for the Electronic System for Travel Authorization, and is a program administered by US Customs & Border Protection (part of the Department of Homeland Security). It's used by people in Visa Waiver countries to submit information about themselves & their travel plans, before they depart their country of origin.
More info here: https://www.cbp.gov/travel/international-visitors/esta
Info on the Visa Waiver program: https://www.cbp.gov/travel/international-visitors/visa-waive...
I guess Mr. Stenberg could have applied for a B-1 Visa to cover the visit, but I thought the whole reason for the Visa Waiver program was to remove the need for people in member countries to get a B-1.