How do ‘expert opinion letters’ work?

An expert opinion letter is a written assessment prepared by a recognized expert in the relevant field. In the context of the H-1B, it serves to reinforce that the role is genuinely specialized and that the candidate has the technical qualifications required to perform it.

In practice, this document typically explains:

• Why the position is unique or demands an advanced level of technical knowledge.
• The scope of the duties and the technical requirements involved.
• How the candidate’s background connects to those requirements.

The weight of the letter depends heavily on the credibility of the person who signs it: the more recognized the expert in the field, the more relevant the opinion tends to be. The letter also needs to be clear, grounded in concrete facts, and consistent with the rest of the petition, without contradicting other documents.

It is worth noting that the expert opinion letter is a supporting piece of evidence, not a guarantee of approval. Because what is expected of it can vary from case to case, confirm the current guidance with USCIS or with a specialist before requesting one.

About the author

Victoria Harper

Editor-in-Chief

Meet the author

As a journalist and lead editor at Visto n’ Visa, Victoria helps ensure that immigration topics are covered in a clear, trustworthy, and easy-to-understand way. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.