How to find someone employer

Do you mean how to find someone's employer, or how to find someone an employer?

If you want to know who someone's employer is, then what is your reason for wanting to know this? If you wanted to know for legitimate reasons, for instance, knowing someone's income level because you want to rent a house to them, then I would think you would already know how to find this info out and wouldn't be asking us. Meaning, I'm wondering if you just want to know because you want to know for personal reasons. In which case, it is none of your business unless they care to tell you.