Going to visit the boss?

Question

Grandpa seemed to be in one of those crazy question asking mood again.
“So here is this guy.” Said Grandpa. He was reading a book.

“He is in the Tesla near Edison going to visit the boss. On his way he
might pass Langley and even see Einstein.” Continued Grandpa.

“So son, please tell me: What is on his head?”
That stumped me. Who is the boss? Why Langley?

Gareth McCaughan · Accepted Answer

I kinda hope this answer is wrong for reasons that will become apparent, but perhaps on his head is

because

The reason I don't feel terribly satisfied with this answer is that

One Answer