Who produces heir hunters?

There's no single producer of "heir hunters" as the term itself isn't a recognized profession or industry.

Here's what's likely happening:

* You're referring to a specific TV show or documentary. If so, you'd need to tell me the name of the show to identify the production company.

* You're thinking of people who find missing heirs. These individuals or companies might be involved in:

* Heir locating services: They use genealogical research, databases, and other methods to find heirs who may be entitled to inheritances.

* Probate research: They help locate heirs for estate administrators who need to distribute assets.

* Genealogy research: Sometimes, genealogy researchers may stumble upon missing heirs while working on a family history project.

If you can provide more context about the "heir hunters" you're thinking of, I might be able to give you a more specific answer.