DS-2019 (formerly called IAP-66):
Your DS-2019 should be currently valid (not expired). All of the information
on your DS-2019 should reflect your current situation (e.g., name, field,
activity, completion date).
Passport:
A J-1 scholar should maintain a valid passport at all times. Federal
law does not allow a J-1 visa holder to enter the United States or to
be employed in the United States if the passport is expired.
J-1 scholars should contact their consulate in the U.S. for passport renewal
information. Addresses and telephone numbers for
foreign consulates in the U.S.
Entry visa stamp:
The J-1 entry visa stamp is issued by a U.S. embassy or consulate and
allows an individual to enter/re-enter the United States. A scholar`s
legal J-1 status in the U.S. is not dependent on whether the entry visa
stamp is valid or expired. Scholars must have a valid entry visa stamp
in their passport to re-enter the U.S. from overseas.