Here's some info for you
H2B Work Visa.
U.S. Work Visas
H-1B Work Visa
H-2B Work Visa
All foreigners who wish to work in the United States must first obtain a work visa. A work visa is a temporary permit to live and work in the United States. Individuals who work without the appropriate visa are breaking the law and may be deported.
A work visa may be obtained prior to entry into the United States or the applicant may change status after entering the United States on a different visa. Changing status from
F-1 Student Visa to
H-1B Work Visa is quite common among international college students.
H-2B Work Visas are available to workers without higher education,
E-3 Work Visas are only for Australian citizens, and
H-3 Trainee Visas are available for short-term training at American companies.
What kind of work was he hired to do?