Curious Headline

A curious headline caught my eye just now:

Man who discovered Van Allen Belts dies

And who is this mysterious "man" spoken of in the headline, that discovered the Van Allen Belts?

IOWA CITY, Iowa (AP) -- Physicist James A. Van Allen, a leader in space exploration who discovered the radiation belts surrounding the Earth that now bear his name, died Wednesday. He was 91.

Quick, who's buried in Grant's Tomb?