Why is Norman Lear wearing a hat?

Norman Lear is currently making the rounds on talk shows promoting his new book. I seen him on two of them, each time wearing a hat. Is he ashamed of baldness, or is there something more to it than that?

Norman Lear almost always wears a hat.

it hides the pen marks on his head.

I think probably the only time Norman Lear doesn’t wear a hat is in the shower. Where, thankfully, I have never had the chance of seeing him. :eek: