Dr. Caroline Leaf is the author of Switch On Your Brain and holds a PhD in communication pathology from the University of Pretoria, South Africa. Since 1981, she has researched the science of thought as it relates to thinking, learning, renewing the mind, gifting, and potential. Dr. Leaf is an international and national conference speaker on topics relating to optimal brain performance, such as stress, toxic thoughts, male/female brain differences, thinking and learning, controlling our thought lives, wisdom, and how to identify and use one's natural gifts. She is frequently interviewed on TV stations around the globe, has published many books and scientific journal articles, and has her own TV show, Switch On Your Brain. Leaf and her husband, Mac, live with their four children in Texas.