Neil Gaiman, author of American Gods, Norse Mythology, The Graveyard Book, and many other titles is a dedicated fountain pen user. He’s talked publicly about his love of fountain pens many times, so with some research it wasn’t too hard to figure out what he’s been using over the years. He famously handwrites the first draft of his books using a fountain pen and then later edits them.
Gaiman, in 2012, mentioned that he has had between 40 and 60 pens, so this list will not be in any way complete but we’ll cover the pens he has talked about publicly.