The L-1B nonimmigrant classification enables a U.S. employer to transfer a professional employee with specialized knowledge relating to the organization’s interests from one of its affiliated foreign offices to one of its offices in the United States. This classification also enables a foreign company which does not yet have an affiliated U.S. office to send a specialized knowledge employee to the United States to help establish one. The employer must file Form I-129, Petition for a Nonimmigrant Worker with fee, on behalf of the employee.