sex : male.
age : 30.
native planet : born in the Federation, but his ancestors were black Africans from Sol 3.
Grenville was the explorer who told the Bean and Hais about his job.

They were worried that he’d be rude to them.  We were nervous as we went to the college dining room, but we needn’t have worried.  If a typical explorer was male, young and short-tempered, Grenville wasn’t typical.  He was male – a huge black man.  He was quite young – he looked about 30.  But he wasn’t short-tempered; he was brisk, but he was friendly. See the Bean’s Report F.