One of my friend was in OPT from September and he went to Nepal in November before getting a job here. He, now, has got new I-20 from another University for PhD. Now, my question is whether he needs to get another VISA to come back US or not? His VISA from last time will expire after 2 years from now. Did any of you have same problem before or know about it. Any suggestions will be highly appreciated. 

Thank you!