Ahem, > "usually wearing in his trademark black fedora "
I recall reading an interview when he stated it is a "Borsalino".
I wrote to him once, ending, as usual wiht "Irealise you are very busy and will understand if you are unable to reply". After a couple of months I got a reply, apologising for the delay, and responding in detail to what I'd written.
de Chelonian Mobilus!