H1B visa Activation

[drspecialist]

Dear Friends

Please I have an enquiry, I have applied for H1B visa for the USA this year and I have got the approval and have stamped the visa (17 November 2009) in my passport through the American Embassy in London -United Kingdom as I live there now. Please I have 2 enquiries for you and I will be grateful if you can help me:

1) I am doing a PhD now in the UK and I am in the last part of it (around 6-8 to finish), now I am worried about my H1B visa situation, I was thinking to visit the USA early next month, meet with my employer and activate the visa and then go back to the UK till I finish my PhD and then go back to the USA later for work (The H1B visa erxpires June 2012), I do not know if this is correct or not?
2) If I wait till I finish my PhD completely then go to the USA, there will be a delay in visa activation for around 8 months which I do not know if this will affect anything in the future.

Actually I am interested in applying for Green Card through through my employer coming year , and I do not want anything to affect my application or status.

N.B.: I have a multiple valid visitor visa till 2013 to the USA, so upon entry to the USA which visa I should use (The H1B visa or the Visitor visa?

Thanks very much and hope to hear from you soon

[Marco 72]

I'm not an expert, but I don't know how you can 'activate' the visa unless you start working for your employer. Would you actually be employed after going back to the UK to finish your PhD (e.g. taking a sabbatical from work)?

By the way, I recommend you post on the following forum, where you'll find many more people familiar with US immigration matters:

http://britishexpats.com/forum/forumdisplay.php?f=34