Happy New Year to all of you and thanks in advance for any constructive input.
My co-worker has just been approved for HK Naturalization and has been asked to submit the documents proving that he has renounced his current Citizenship before they can issue him with a "Certificate of Naturalization".
He is a "Indian" national but has a permanent US Green card for over 20 years. He travels to and from the US for work every 6 weeks using his Indian passport and Green Card with no hassle. He also confirmed that he has maintained his US residence by making 2-3 trips a year.
The question is: If he decides to take up a HKSAR passport, is his Green Card still valid or is it locked to his Indian Passport? Would he have to reapply for US residence? Is anyone familiar with how this works?