The birth certificate is all you need.

H1-B change of employer relationship?

You should discuss with Insperity. They have done this thousands of times and know exactly what to do, which is basically nothing.

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Can I travel after getting married to US citizen while I am on F-1 OPT stem extension?

There is NO reason to marry a US citizen and then travel. That puts you in jeopardy of not getting an F-1 visa, if you need one, or being admitted...

Can I travel into the us while my I-485 is on process ?

If you filed the 485 you should be living in the US and visit other places, not living outside the US and come here to visit. You also need an...

How can I prove my deceased husband is same person ?

You need to consult with a Board Certified family lawyer and immigration lawyer to address these issues. You cannot resolve them via email.

I 94 expired on April 16th, H1B petition is denied on May 23rd Please advise my options on employeement in USA

You need to take the denial to a Board Certified immigration attorney. It is interesting that those who access AVVO almost never consider the fact...

How many days will take to process h4 visa to f1 visa as per current situation? Can I do my application in premium?

You need to talk to your school since you are actually talking about a change of status not a change of visa.

What are possible issues/risks that STEM master graduating in 2020 should be prepared for while seeking US work visa ?

AVVO is not to be used this way. You need to consult with Board Certified Immigration attorney.

Immigration and 10 years green card advice before getting a lawyer

You need to consult a Board Certified Immigration attorney immediately.

Can i apply for NIW greencard if I’m working during my OPT?

You should consult with a Board Certified immigration Attorney. This can not be answered without much more information about you.