Webber Law Firm, LLC is very familiar with issues commonly known as “AC21 portability,” related to a foreign national changing employers after being sufficiently far into the green card process. These issues are particularly common for people with long-pending I-485 applications based on the July 2007 Visa Bulletin and immigrant visa number retrogression.
We have helped to analyze these issues and represent clients in updating their profile with USCIS. We can also assist in maintaining interim work and travel benefits.
We are also familiar with related issues like priority date retention, cross-chargeability, or changing eligibility for a pending I-485.
Principal Attorney Robert Webber has written a brief article on AC21 Portability, which you may access here.