I can try to help you. Do you have:
* Name(s)--all names, versions of names, possible spellings
* Time periods--all dates that you have, when did your father enter the U.S., if he lived in more than one place, dates that he moved, etc.
* Places--did he come here for college, or work? If so, where? All places that you know of where he studied and/or worked. (Again, dates.)
* Relatives--did he have any relatives here that you know of?