media planner
US /ˈmiː.di.ə ˌplæn.ər/
UK /ˈmiː.di.ə ˌplæn.ər/

1.
a person whose job is to decide where and when advertisements should be placed to reach the target audience effectively
:
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The media planner recommended placing ads on social media and prime-time TV.
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A good media planner understands audience demographics and media consumption habits.