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It would be ideal to be able to chose the person who understands the cause and shares the same passion to help it. However, you would have to ensure that this person does not hand it down to someone to do the work for him, as that person may not share the same interest and will become an obstacle. I agree with Ivy who shared that documenting everything and a contract would ensure that the partnership is sustainable regardless of the person in charge. If the partnership is mutually beneficial, then there would be more likelyhood that the partnership is a strong and sustainable one.