April Author Study. Famous Author Birthdays PowerPoint. To engage your readers and inspire your writers, show these slides of famous authors who had birthdays in April: Hans Christian Andersen, Washington Irving, Maya Angelou, Anthony Horowitz, Beverly Cleary, Gary Soto, Marguerite Henry, Lee Bennett Hopkins, Barbara Park, William Shakespeare, Maud Hart Lovelace, Patricia Reilly Giff, and Lois Duncan. Engaging fun facts and information given on each classic author and their most famous works. H