To her adoring public, actress Lamarr was a glamorous movie star. But in private, she was something more: a brilliant inventor. Learn the inspiring story of how, during World War II, Lamarr developed a groundbreaking communications system that still remains essential to the security of today's technology. Illustrations.

Laurie Wallmark has degrees in Biochemistry from Princeton University, Information Systems from Goddard College, and Writing for Children and Young Adults from the Vermont College of Fine Arts. Her debut book, Ada Byron Lovelace and the Thinking Machine (Creston Books), received four starred reviews (Kirkus, Publishers Weekly, Booklist, and School Library Journal), praise in The New York Times, and numerous awards. Laurie lives in NJ. Twitter: @lauriewallmark.

With a BFA in Illustration and Entertainment Arts from Pasadena Art Center College of Design in 2007, Katy Wu has worked for Google, Laika, Pixar, CinderBiter, and Simon & Schuster. Grace Hopper was her first picture book; her second was Dumpling Dreams, written by Carrie Clickard (Simon and Schuster). She has also worked on such projects as the feature film Coraline. She lives in New York City. Follow her online at katycwwu.tumblr.com.