H-1B: The H-1B is an employment-based, non-immigrant visa category for temporary workers specialty occupations that generally requires a bachelor’s degree or higher degree (or its equivalent) as a minimum for entry into the occupation.
O-1: The O-1 non-immigrant visa is 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.
TN: 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.
R-1: An R-1 is a foreign national who is coming to the United States temporarily to be employed as a minister or in another religious vocation or occupation
L-1: The L-1 visa enables the temporary transfer of foreign worker in the managerial, executive or specialized knowledge category to the U.S. to continue employment with an office of the same employer, its parent, branch, subsidiary or affiliate.
E-3: The E3 visa is a United States visa for which only citizens of Australia are eligible. The E3 visa allows for the temporary entry into the United States of individuals who are to perform services in a specialty occupation for a U.S. employer