Moving to atlanta

Currently living in France but moving to Atlanta in July '14. I have a 21 year old son who wants to move with us to study for a year or two. As he is an adult what kind of permit/visa does he need in order to travel with us? Will his length of stay be limited or is it renewable depending on the length of his study?
Thanks in advance for any helpful information you can offer :)

Hello taffy. :)

Have you consulted the USA pdf guide?
It may help.

Thank you,
Aurélie

Thank you Aurelie, I will check it out
Merci bien et joyeux paques