Many immigrants have managed to be successful in the United States thanks to the help of a work visa. In this category, one of the most wanted is the O-1 Visa. This Visa has helped many professionals to start their careers in the United States.
General information on O-1 Visa:
The O Visa category is comprised by three types of Visa: O-1, O-2 and O-3.
The O-1 Visa is for individuals wih extraordinary abilities in science, education, business, sports, arts. It is also targeted at those people who throughout their career have demonstrated a history of exceptional achievements in film, television or have been acknowledged national and internationally for their achievements.
Although these are not exclusive, the following are examples of common professions that may apply for the O-1 Visa:
Visa: artists, entrepreneurs, models, chefs, business professionals, doctors, scientists, actors/actresses, professors, directors, stage 
designer, choreographer, orchestra directors, entertainment professionals, jugglers, arrangers, makeup artists, stage technicians, animal trainers, musicians, artists, visual artists, culinary artists, specialized mechanics, designers and creative and technical staff.
This is considered a non-migrant Visa; thus, it is not aimed at giving permanent legal residency to its holder in the United States.
You may present an application for a O-1 Visa up to a year prior to the date you want it to become effective. However, the majority of the people present the application between 3 to 6 months before the initiation date.
Visas O-2 are for the supporting staff of Visa O-1 holders. Thus, holders of O-1 and O-2 Visa must have known each other for a long period of time. The spouses and unmarried children of holders of O-1 Visas have the right to access to an O-3 Visa in order to accompany the holder of the O-1 Visa.