Kathleen Krull’s Giants of Science books are recognized as a unique series in which biography, social history, and scientific discoveries blend together into compellingly readable books for older readers. The books in the Giants of Science series—Leonardo da Vinci, Isaac Newton, Sigmund Freud, Marie Curie, Albert Einstein, Charles Darwin, and Benjamin Franklin—have garnered a galaxy of starred book reviews. Kathleen Krull lives in San Diego, California. Visit her at KathleenKrull.com.

Tavia Gilbert is an acclaimed narrator of more than four hundred full-cast and multivoice audiobooks for virtually every publisher in the industry. Named the 2018 Voice of Choice by Booklist magazine, she is also winner of the prestigious Audie Award for best narration. She has earned numerous Earphones Awards, a Voice Arts Award, and a Listen-Up Award. Audible.com has named her a Genre-Defining Narrator: Master of Memoir. In addition to voice acting, she is an accomplished producer, singer, and theater actor. She is also a producer, singer, photographer, and a writer, as well as the cofounder of a feminist publishing company, Animal Mineral.