Hi, I have had a successful experience working as an internet detective (tracking people down).
What I first need is all the background information you have about the subject: name, surname, SSN, last known address, last known phone, age, whatever information you may have.
Then, I will start analysis checking SSN, advancedbackgroundchecks and other specialized background checks, find out potential relatives, use social networks to fine tune search of individual, and if needed google keyword research.
90% successful rate guaranteed!
Regards,
Bruno