SRVNLAW- Working in USA

H Temporary Worker Visa
These visas are for persons who wish to pursue temporary employment or training in the United States - with the exception of certain athletes, entertainers and persons preeminent in their disciplines. Initially, all applicants for such visas must have a petition filed and approved by the U.S. Citizenship and Immigration Services (USCIS). The petition is the process by which the Department determines that the applicant has satisfied the basic qualifications for a particular visa. Further, while applicants in the United States can adjust their status to the new visa, applicants outside the United States may apply for a visa at a consulate.

H-1B applies to those who wish to engage in a Specialty Occupation
H-4 applies to a spouse/child of a temporary worker or trainee
H-1C applies to those who wish to engage applies in the United States to a Registered Nurses .The category applies to foreign nationals coming temporarily to perform services as a registered nurse in a health professional shortage area as determined by the United States Department of Labor.
H-2A applies to those who wish to work in the United States as special agricultural workers
H-2B applies to those who wish to work as qualified temporary workers of a type unavailable in the U.S. at the time and place required, not to exceed three years
H-3 is for a person going to the U.S. temporarily to receive training in any field of endeavor (other than graduate medical education or training) where the proposed training is not available in the person's own country and the person will not engage in productive employment unless such employment is incidental and necessary to the training

H-4 visas are for a spouse/child of a temporary worker or trainee

L Intra-company Transferee Visa
This visa is issued to foreign nationals who works for a multinational business and has a need to work temporarily in a U.S. office of the same business.

L-1 is for a intra-company transferee
L-2 is for a spouse/child of an intra-company transferee . L-2 spouse only can apply for employment authorization.

E Treaty Trader and Treaty Investor Visa
This nonimmigrant visa is available only for foreign nationals of countries with which the United States maintains a treaty of commerce and navigation.

E-1 Treaty Trader visas are for foreign nationals coming to the United States to carry on substantial trade, including trade in services or technology, principally between the United States and the treaty country.

E-2 Treaty Investor visas are for foreign nationals coming to the United States to develop and direct the operations of a US business in which the foreign national has invested, or is in the process of investing a substantial amount of capital.

R Religious Worker Visa
R Visas applies to a religious worker who wants to go to the U.S. to work for a genuine non-profit religious organization or denomination:

as a minister of religion; or
At the request of the organization, or an organization affiliated with the denomination, in a religious vocation or occupation, whether in a professional capacity or not.

R-1 visa is for a religious worker
R-2 visas is for a spouse/child of a religious worker

O Persons of Extraordinary Ability Visa
This visa applies to persons with an extraordinary ability, for example, an athlete or scientist, and wants to go to the U.S. temporarily to continue work in their area of extraordinary ability.

O-1 is issued to a person with extraordinary ability
O-2 is issued to a person who will accompany and solely assist the person with extraordinary ability
O-3 is issued to a spouse/child of O-1 or O-2 applicant

P Performer Visa
This Visa applies to athletes, artists and entertainers who are going to the U.S. temporarily to compete or perform.

P-1 is for an internationally recognized performer who wants to go to the U.S. temporarily to perform
P-2 is for an person going temporarily to the U.S. to perform as an artist or entertainer, individually or as part of a group, under a reciprocal exchange program between the U.S. and one or more foreign states
P-3 is for an person going temporarily to the U.S. to perform, teach or coach as an artist or entertainer, individually or as part of a group under a commercial or noncommercial program that is culturally unique
P-4 is for a spouse

V- Visa
Visas under this category are available to spouses and unmarried children under age 21 of Lawful Permanent Residents where a relative petition (I-130) has been filed for the individuals before December 21, 2000 and that there is a pending application for an Immigrant Visa abroad or there is a pending application to adjust states in the United States. This category of visa was created under the Legal Immigration Family Equity Act.

WORKING IN USA