People who work in STEM (science, technology, engineering and math) fields and want to work temporarily in the U.S. often try to get an H-1B "specialty occupation" visa. These visas are only available to a limited number of people each year, however, and they are issued on a lottery basis.
Recently, we've been getting a lot of questions about changing work conditions or terminations among people with visas that are sponsored by a specific employer. This can put you out of status, and you should take action as soon as possible to file an extension or change of status.
An O visa is a non-immigrant temporary visa granted to individuals who possess extraordinary talents or achievements. Generally, the individual must be nationally or internationally recognized for their talents.