A good author bio is a short, authentic, authoritative, and approachable summary of an individual's expertise, credentials, and personal interest, with a focus on showcasing their unique value proposition to readers. It should start with a compelling opening sentence that grabs the reader's attention, followed by a clear explanation of why the writer cares about the topic, and then highlighting their credibility through achievements and expertise relevant to the subject matter. The bio should also be approachable by sharing an unexpected skill or interest outside of work, or showing how they apply their work expertise in their personal life, and conclude with a single, intriguing call to action that encourages readers to take the next step. By following these guidelines, authors can create a bio that adds credibility, makes content more effective, and even drives conversions.