U.S. companies can utilize temporary work visas to hire employees for set lengths of time. If the foreign worker decides they want to remain in the United States, the company has the option of sponsoring the employee for permanent residency (a green card) while the employee continues to work on a visa. There are a number of different types of temporary work visas.
H1B visas are available to specialized workers with college degrees coming to work in their field of expertise. U.S. companies with foreign affiliates have the option of sponsoring employees who have worked for the foreign affiliate for at least a year for L visas, either an L1A visa for employees with specialized knowledge or an L1B visa for managers. Foreign-owned businesses may qualify to sponsor employees for either E-1 or E-2 visas if they conduct substantial trade with their home countries or make a substantial investment in the U.S. Employers can sponsor employees with extraordinary ability in their field for work visas in the United States. TN visas are available to Canadian and Mexican professionals in designated occupations.