Author voice is more than favorite phrases. It includes rhythm, humor, vocabulary, conviction and the way a writer explains an idea. Before collaborative writing begins, collect interviews, existing work and examples of language that feel natural to the author. Agree on what should sound familiar and what may need clarification for readers.
Review drafts in stages and invite specific feedback: which lines feel true, which sound unlike you and what important nuance is missing? This shared process gives the writer control while helping an editor or ghostwriter provide structure. The goal is a clearer manuscript that still feels unmistakably like its author.