How do I do an international search for someone?

Question: How do I do an international search for someone!?

I know my biological father's DOB, last known city he lived in, full name and occupation!. Is it possible through the internet to find him myself or will I need to hire someone!? If so, what are some reputable investigators!?Www@QuestionHome@Com

Best Answer - Chosen by Asker:

Have you tried googling him!?
also!.!.!.try googling the address - that may give you a clue!. Write to the current occupants of the old address and see if they can give you a forwarding address!.
Do you have the company he last worked for!? Try asking someone there too!.Www@QuestionHome@Com