Final answer:
The HIM director acts as a Data Steward, ensuring proper management of data throughout its lifecycle and adherence to data policies and regulations.
Step-by-step explanation:
The role responsible for controlling when changes are made to data definition and business rules within the context of a Healthcare Information Management (HIM) director is known as Data Steward. This individual ensures that the data is managed properly throughout its lifecycle, making sure that data policies and regulations are followed.
It's akin to the director in a theater or film, overseeing the production to ensure that the final product is true to the intended vision. The data steward acts as the intermediary between IT and the business side, balancing technical capabilities with business requirements.