Question:

Who is the Task Owner in a Report in Vault PromoMats and Medical?

Answer:

A Task Owner is a user assigned to a specific task in a document workflow.

A report can show documents for which a user has a task to complete in that workflow. 

By selecting the Report Type --> Workflow with Document, the Task Owner option can be found in the filters:

This filter behaves as follows:

Related Documentation:

Vault Help Documentation: Report Basics Video Tutorial