I must admit, that I don't know the process since I hold both passports which makes the border transparent for me. Several of my workmates live in Canada & work south (in sales). I know there is a paperwork process that is usually best left to a US immigration lawyer.
A quick Google turned up this: Everything you need to obtain a USA work visa
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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