Yes. Contact the new company's US immigration attorney for strategy clarification.

What if my parents (B2 visitor) stay with expired I-94 due to medical emergency and leave US with a pending I-539 eventually ?

Contact a US immigration attorney regarding I539 and traveling strategy.

Contact the company's US immigration attorney for strategy & filing assistance.

Contact the company's US immigration attorney for follow-up assistance.

Can my wife get her H4 visa stamped in Mexico if she has has had multiple COS (H4 -> F1 -> H1B -> F1->H4) within the US ?

Contact a US immigration attorney for review and to discuss home-country processing, not Mexico.

What is the process of Nunc Proc tunc for H1-B and how much is approval rate?

Contact the company's US immigration attorney for review.

Is there a specific date you have to submit your AOS by after getting married on a K1 Visa?

Review the instructions at www.uscis.gov - you must marry prior to the 90 days. Contact a US immigration attorney regarding AOS timing issues.

Under the current immigration rules, how does the I-140 and post 6 year H1B extension work with job change?

Contact a US immigration attorney for specific review and timing issues (180 days after i140 approval etc.).

L2 EAD new application processing time?

EADs are generally taking 3 to 4 months currently.

Can I enter the US with my expired green card and my i797c?

Contact a US immigration attorney for INFOPASS assistance.