Mark A. Williams Mark A. Williams, PhD, is a professor of cognitive neuroscience with over 25 years’ experience conducting behavioral and brain imaging research. Williams has published more than 70 scientific articles and received numerous high-profile fellowships an grants. He has made many TV and radio appearances to discuss topics including emotions, technology, education, racism, and even why we can’t tickle ourselves. His research has been featured in outlets globally including The New York Times, The Economist, The Guardian, and New Scientist. He lives in Australia. Read More Read Less