Who has donated the most in-demand type of blood for sickle cell patients?

Peter Jones has donated his Ro blood, the type needed to treat sickle cell sufferers, more than 102 times, more than any other Black donor.

Who has donated the most in-demand type of blood for sickle cell patients?
Peter Jones has donated his Ro blood, the type needed to treat sickle cell sufferers, more than 102 times, more than any other Black donor.