William Lidwell is the Chief R&D Officer at Avenues: The World School, where he leads teams tasked with conducting research in education and the learning sciences; the development of new educational curricula, programming, and technologies; and the architecture and design of new campuses around the world. The co-author of Universal Principles of Design and The Pocket Universal Principles of Design, he has written other books in a variety of disciplines, including design, education, and management. His online lectures on the psychology of color are available at TheGreatCourses.com, and his online courses on the universal principles of design and logo design are available at LinkedInLearning.com. He lives in Houston, Texas. Kritina Holden is a Human Factors Technical Fellow with Leidos at the NASA Johnson Space Center. She has over thirty years of experience working in the area of Human Factors, with a focus on human-computer interaction (HCI), human-centered design, and usability. She has served as Principal Investigator for several NASA-funded research efforts, including studies onboard the International Space Station. She is also a subject-matter expert for all of the major spaceflight programs. Tina received her Ph.D. in Engineering Psychology from Rice University. She lives in Houston, Texas.Jill Butler is the founder and president of Stuff Creators Design, an interaction design consultancy. She has over twenty years of experience designing, teaching, and consulting in the areas of graphic design, information design, and typography. She has designed covers, layouts, and typography for more than a hundred published novels and children's books, and more websites than she can count. Her current focus is the UI/UX design of global online K-12 learning systems. Her online courses on the universal principles of design and typography are available at LinkedInLearning.com. She lives in Houston, Texas.
