All students, when hired for the first time, need to get a social security number. Social security numbers are issued by the social security administration office. For the student to apply for it, the International Office, upon the request of the student's hiring department/employer, can issue a letter addressed to the Social Security Office.
Before the International Office issues the letter, the student has to submit to the International Office a letter from his/her department/employer stating the following:
Please refer to the Social Security Office job offer letter template.
For more information on work elegibilty, how to apply and other questions , go to Social Security Administration website.