Regarding H1B from existing OPT (F1 Status) after PhD from US university

Whether or not you need to leave will depend on how the petition was filed by the employer's immigration attorney - you need to ask them.

Converting L1A to H1B and eligibility in EB1C (keeping role as Manager)

If you change employers, you will not be eligible for EB-1C anymore, unless the new employer meets the requisite relationship requirements to your...

I want to go to canada for studies, i have funds for the tution, but i want my boss to co-sponsor me? Is that possible.

This forum is for U.S. immigration issues. You need to consult with a Canadian immigration attorney.

Can I sponsor my husband while we both are outside USA

First you need to make sure you that you are still considered a U.S. permanent resident and have not abandoned your permanent resident status. If...

When should I apply for L1A visa ?

Your employer's immigration counsel will make the application at the appropriate time - after you satisfy the requirement of being in a managerial...

Your DUI will not impact your ability to sponsor your spouse by filing Form I-130.

Valid H1B vIsa with validity till SEP 2015. Client changed but role remains same. Is it LCA or Amendment??

That will be up to your employer's immigration counsel.

Will my wife face any challenge while entering USA?

The issue is not whether or not your wife will be traveling alone, but rather, whether she (and you) will demonstrate to the satisfaction of the...

I received receipt for the l2 extension.can I apply ead extension ? My status expires on 17th apr.l1 visa extension in process

Yes, you can apply for your EAD with the L-2 extension receipt notice - you could have filed the EAD at the same time that the L-2 extension was...

When I am applying for an extension to new office L1-A, is it still necessary to file with USCIS before applying at consulate?

Clearly you need the assistance of immigration counsel. You need approval of the L-1 petition from USCIS before you can apply for the visa from...