Who typically fulfills the role of the 'Ground Truth Teller' in a personal board of advisors?

Answer

Someone working in the opposite function to give necessary perspective.

The 'Ground Truth Teller' component in a personal board involves seeking advice from someone whose function is opposite to yours (e.g., finance advising a creative) to gain necessary perspective.

Who typically fulfills the role of the 'Ground Truth Teller' in a personal board of advisors?
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