Expert Opinion Letters You Can Trust
Get a USCIS-compliant expert opinion letter for your immigration petition. Written by qualified experts to strengthen your case, RFE response, or appeal.
Visa Categories We Support
Expert opinion letters tailored to the specific requirements of each visa category.
H-1B Specialty Occupation
Demonstrate that your background qualifies you for a specialty occupation position.
L-1A Manager / Executive
Support your intracompany transfer as a manager or executive.
L-1B Specialized Knowledge
Establish specialized knowledge for intracompany transfer petitions.
O-1 Extraordinary Ability
Document your extraordinary ability in sciences, arts, education, business, or athletics.
EB-1A / EB-1B
Support your extraordinary ability or outstanding researcher petition.
EB-2 / NIW
Strengthen your National Interest Waiver or advanced degree professional petition.
P-1 / P-3 Athletes & Entertainers
Expert assessment for internationally recognized athletes and entertainers.
How It Works
Four simple steps from upload to delivery
Create your GCS account
Sign up and tell us about your visa category and case details.
Upload supporting documents
Provide your resume, petition materials, and any RFE notices.
Submit your application
Complete the application form and submit payment.
Receive your letter
Your expert opinion letter is delivered, reviewed, and ready to file.
Why Choose GCS for Your Expert Opinion Letter
Written by Qualified Experts
Each letter is prepared by a university professor or qualified industry expert with relevant credentials and publications.
Case-Specific Assessment
We analyze your unique qualifications, experience, and achievements — no generic templates or boilerplate language.
Evidence-Based Support
Every claim in the letter is backed by evidence from your case materials, strengthening your petition's credibility.
Strong, Structured Arguments
Our letters follow USCIS adjudicator expectations with clear legal reasoning and structured arguments built for approval.
Fast Delivery
Standard delivery with rush options available. We keep you updated throughout the process.
Frequently Asked Questions
Expert Opinion Letters are completed by professors or distinguished industry authority in order to provide an “Expert Opinion” for extraordinary ability petitions, responding to RFE's, or for any other case that requires the opinion of an expert in the field. It specifically addresses an individual's academic and employment experience qualifications to satisfy U.S. Citizenship and Immigration’s requirements.
Requirements vary depending on the type of visa you are applying for. Please refer to the “Documents Required” section for a detailed information.
Our standard processing is 7 to 9 business days. Rush options are also available are needed for an additional fee.
Our rates vary per visa and letter type. All you need to do is start your application, upload your documents and request for a quote. We will respond to you asap with the quotation on how much the cost will be.
Several factors are considered when applying for a US visa, and not based on the expert opinion letter alone. In such instances that refunds are requested, it will be reviewed accordingly and will be given (if any) at our sole discretion.