documentarian

noun4

1. •
   A person whose profession is to create documentary films.
2. •
   A person who writes software documentation.

   • After you have gone through all these steps, you are ready to tackle your company's documentation problems. You have also become an experienced systems documentarian... — 1976
3. •
   A person who cares about communication and documentation.

   • ...the developer with an aptitude for or an interest in writing assumes the task of documentarian. — 2016
4. •
   [before a noun] Somebody who advocates the documentary hypothesis.