It's possible that:
* The name is misspelled. Double-check the spelling for accuracy.
* The person is working under a different name. They may have a stage name or use a different professional name.
* They are involved in independent or local projects. Their work may not be widely known.
If you can provide more information about Leanne Cochran, like a specific time period or type of project, I might be able to help you further.