If you are doing a background investigation, then the subject’s employment history is important data. Here are a few sites where a subject may post a resume.
Of course, the first stop is LinkedIn to start getting a handle on the subject’s employment history. Next, go to indeed.com for the US and ca.indeed.com for Canadians. Use the advanced search and enter the subject’s name in the phrase search. Then do the same for all of the words of his name.
Odesk.com is for hiring freelance professionals. Use the search box with ‘freelancers’ selected and search the subject’s name.
Resumebucket.com is an interesting site. I often get better results using the Google site: command and the person’s name than using the site’s search facility.
Beyond.com requires an account to search or you may use the Google site: command with the subject’s name.
You can also search the relevant local craigslist site and use the search facility to search the subjec’t name in quotations. Sometimes you will find brief resumes for people seeking work.
The monster.com job sites have a lot of resumes but you have to pay to search them. If you do enough searching then this is worth the cost.