If they have a business (B-1) visa, permanent residency, or a business sponsored visa (i.e. H-1B).
Yes, a UK citizen can work in the US with the appropriate visa or work authorization.
Yes, as a US citizen, you can work in the UK by obtaining the necessary visa or work permit.
Yes, a US citizen can work in the UK by obtaining the necessary visa or work permit.
Yes, a US citizen can legally work in the UK by obtaining the necessary visa or work permit.
She would need a UK work visa.
Yes, a US citizen can work remotely in the UK without needing a work visa as long as they are not physically present in the UK for more than 90 days in a 180-day period.
A US citizen would have to apply for a visa and become resident. Alternatively they could marry a UK citizen. In addition a British Company could invite the US citizen to work in the UK and apply for a work visa on their behalf. There are quite a few ways to do it legally.
Whether a US citizen can work in Japan is completely unrelated to that person's UK residency status. It is a matter for Japanese law and regulations.
Yes, as a US citizen, you can work in London. However, you may need to obtain the necessary work visa or permit to legally work in the UK.
US and UK allow Dual citizenship. A person can be a US citizen and a citizen of UK if he/she desires to. But if a person applies to get naturalized as a citizen of UK when he/she is already a US citizen, then it will lead to losing US citizenship.So a person can have US & UK citizenship as long he/she is not a naturalized citizen of UK.
Yes, US citizens can work in the UK, but they may need to obtain a visa or work permit depending on the type of work and length of stay.
A US trained doctor can work in the UK with the proper visa. There are many jobs available in both the US and in the UK for medical professionals.