What is an EB-1C Expert Opinion Letter? An EB-1C Expert Opinion Letter is a document that supports an individual’s qualifications as a multinational manager or executive. Purpose Validate managerial or executive experience Support eligibility for permanent residence in the US Benefits Strengthens visa application Provides objective validation of managerial/executive experience Demonstrates ability to manage or execute Increases chances of approval WHY? It highlights the individual’s experience and qualifications in managing or executive roles within a multinational organization.