>ESTA visas for 90 days. No issue there. Wrong. ESTA is not a visa, it's a requirement for all travelers to US. The visa-waiver program (VWP) doesn't include

>ESTA visas for 90 days. No issue there. Wrong. ESTA is not a visa, it's a requirement for all travelers to US. The visa-waiver program (VWP) doesn't include the right to work. You need to have an appropriate visa if you're being paid (or given material benefits) while travelling in US. Things like interviews or conferences or workshops are not included in the right to work requirement.