The worker has a Bulgarian license and can drive acording to the MA RMV but is does make it clear if he can drive company vehiles.
The J1 visa is a work and travel visa good for four months.
See below. Thank you for your help but does this help?
DRIVING IN MASSACHUSETTS
Fact: The “international License” is not recognized in the state of Massachusetts
Fact: All people moving to Massachusetts have 30 days in which to obtain a Massachusetts Driver’s License.
All information regarding Massachusetts Registry of Motor Vehicles can be found at
www.state.ma.us/rmv
For those people who will be here temporarily (up to six months), a list of those countries that have reciprocal privileges is below. This means if you come from a country on this list, and have a valid driver’s license from that country, you do not need a Massachusetts Driver’s License. If your country is not on the list and you are here temporarily, you do need a Massachusetts Driver’s License.
Albania Algeria Argentina Armenia Australia Austria
Azerbaijan Bahamas Bangladesh Barbados Belgium Belize
Benin Botswana Brazil Bulgaria Byelorussia Cambodia
Canada Central African Republic Chile Columbia Congo Costa Rico