Form SSA-7050-4f Social security request for earnings information will yeild names and addresses of the person's employers for the time period you request. Could be useful in establishing where they lived & when. The fee is fairly still it's a sliding scale. Example a 10 year period cost $35. You do NEED their Soc Sec Number. http://www.uftree.com/UFT/WebPages/savage1/SAVAGE/index.htm