Research an author's life and connect it to recurring themes and style found across more than one of their books.
An author study looks past a single book to ask a bigger question: what does this writer keep coming back to, across many different stories, and why? Often a writer's real life directly explains the pattern -- the same experiences, places, or obsessions resurface in book after book, sometimes barely disguised.
Gary Paulsen, the author of Hatchet, had an unstable, difficult childhood and spent much of it finding refuge outdoors, alone, away from a troubled home. As an adult he worked rugged, physical jobs -- including running the Iditarod, the grueling thousand-mile sled dog race across Alaska -- before turning to writing. It is no accident that his fiction returns again and again to survival, self-reliance, and a deep, specific respect for the natural world: Brian's Winter imagines Brian surviving a full winter alone in the wilderness, Dogsong follows a boy's journey by dog sled, and The River sends Brian back into the wild on a second, deliberate survival test.
Mastery looks like: They can name specific facts about an author's life and connect them to a real recurring theme found across at least two of that author's books.
Common stumbles: Naming a recurring theme without any specific evidence from more than one actual title, or inventing a biographical connection instead of researching a real one.