Cap Table Question — angel investor wants board seat

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Illustrative scenario prepared by my practice.
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Hypothetical question

I'm in a difficult situation and trying to figure out my next steps.

angel investor wants board seat. I've been dealing with this for about 16 months now and the situation isn't improving.

I have already consulted briefly with a lawyer but the other party is not cooperating.

What's the typical outcome in situations like this?