Glad you asked...
A credit check can sometimes find where someone is employed. If they live in an apartment or rent their landlord would know where they are employed. There are places online that offer people search for a fee but be careful there are scams and information may not be current.
MsErica     How-To Expert
Then again, this answer might help you...
Finding where someone is employed is typically reserved to police agencies and other government organizations. This information in the hands of a private citizen could be used for harassment or intimidation, so the best way for an individual to find out is to ask.
lawsonrw     How-To Expert
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