As much as it bothers me I will have to go with the Klitchko brothers. They are both p.HD holders, and they earned it through studying and not from some obscure University in the Phillipines.
No one said Muhammad Ali yet?
Probably something to do with him making numerous racial dubious comments, hating and and ruining a good mans character, meeting the KKK, and saying if women can't cook or have babies, what are they for.
Ouma, Miranda. Compared to those two, especially Ouma, everyone else looks like a joke in terms of adversity overcome.
Hopkins in terms of those who have had what could tentatively be called a "normal" life comparatively.