The petitioner 也要是 employer 吗？二者需是同一主体吗？
-In O-1 petition, the petitioner must be the employer (i.e. the employer files the O-1 application for you).
如果是，为何又需要 a letter from the employer?
-In O-1 petition, the petitioner must be the employer (i.e. the employer files the O-1 application for you).
如果是，为何又需要 a letter from the employer?
