Alfred Hitchcock's longtime collaborator, Alexander Graham Bell's assistant, Vladimir Nabokov's wife, Muhammad Ali's first coach, Ernest Shackleton's right-hand man, John Wayne's stunt man, and the little-known sixth member of The Rolling Stones -- on this installment of ST, we're talking about some of the great "sidekicks" of modern history. Our guest is Julia Rothman, one of the editors of a new book called "The Who, the What, and the When: 65 Artists Illustrate the Secret Sidekicks of History," which is just out from Chronicle Books. As is noted of this lavishly illustrated and wide-ranging new volume at the Chronicle website: "This offbeat illustrated history reveals 65 people you've probably never heard of, but who helped shape the word as we know it. Muses and neighbors, friends and relatives, accomplices and benefactors -- such as Michael and Joy Brown, who gifted Harper Lee a year's worth of wages to help her write 'To Kill a Mockingbird.' Or John Ordway, the colleague who walked with Lewis and Clark every step of the way. Each eye-opening story of these unsung heroes is written by a notable historian and illustrated by a top indie artist, making 'The Who, the What, and the When' a treasure trove of word and image for history buffs, art lovers, and anyone who rejoices in unexpected discovery."