Final answer:
An Account planner is the one who acts as the voice of the consumer in creating effective advertising by combining research and account strategy.
Step-by-step explanation:
The member of the account management department who combines research and account strategy to act as the voice of the consumer in creating effective advertising is known as an Account planner. This role involves understanding the consumer's behavior and using that insight to shape advertising campaigns. Account planners work closely with the creative department and clients to ensure that the message of an advertisement aligns closely with the needs and desires of the target audience.