The H1B is a non-immigrant visa in the United States that allows U.S. employers to temporarily employ foreign workers in specialty occupations. Employers must petition for the individual whom they plan to employ or continue to employ in the United States. The duration of H1B is up to 3 years, generally extendable to maximum 6 years.
The L-1 non-immigrant classification enables a U.S. employer to transfer qualifying employees from one of its affiliated foreign offices to one of its offices in the United States. It also enables a foreign company which does not yet have an affiliated U.S. office to send employees to the United States with the purpose of establishing one. The employee qualified under this classification should be either as an executive or manager or with specialized knowledge.
The O-1 is a nonimmigrant visa for the individual who possesses extraordinary ability in the sciences, arts, education, business, or athletics, or who has a demonstrated record of extraordinary achievement in the motion picture or television industry and has been recognized nationally or internationally for those achievements.
The E-1 (Treaty Traders visa) nonimmigrant classification allows a national of a treaty country (a country with which the United States maintains a treaty of commerce and navigation) to be admitted to the United States solely to engage in international trade on his or her own behalf. Certain employees of such a person or of a qualifying organization may also be eligible for this classification.
The fiancé(e) K-1 nonimmigrant visa is for the foreign-citizen fiancé(e) of a United States (U.S.) citizen. The K-1 visa permits the foreign-citizen fiancé(e) to travel to the United States and marry his or her U.S. citizen sponsor within 90 days of arrival. Eligible children of K-1 visa applicants receive K-2 visas.
The North American Free Trade Agreement (NAFTA) created special economic and trade relationships for the United States, Canada and Mexico. The TN nonimmigrant classification permits qualified Canadian and Mexican citizens to seek temporary entry into the United States to engage in business activities at a professional level.