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Your hint doesn't help me much because, as far as I can tell, no individual has been considered the wealthiest person in the world for a period of twenty consecutive years since John P Getty[1], and he's been dead for fifty years. It seems unlikely that he had views about vaccine policy in the USA which are relevant to today, so who are you referring to?
[1] https://www.madisontrust.com/information-center/visualizatio...
You’re talking a lot - but you’re not saying anything!
Can you maybe rewrite this in a way that doesn’t assume everyone that doesn’t know what you apparently know is clued in?