Jonathan David Haidt is an American social psychologist and author.

French aristocrat and political thinker Alexis Charles Henri de Tocqueville transformed how the world understood democracy through his keen observations of 19th-century America.

Friedrich Wilhelm Nietzsche was a German philosopher and writer who started his career as a classical philologist and turned to philosophy early in his academic career.

Massimo Pigliucci is a professor at The City College of New York who has published 194 technical papers in science and philosophy and is the author or editor of 23 books. He is best known for the bestselling How to Be a Stoic: Using Ancient Philosophy to Live a Modern Life (Basic Books). He holds a PhD in evolutionary biology and has also worked as a producer, director, and writer.

Yuval Noah Harari is an Israeli medievalist, military historian, public intellectual, and popular science writer.

Miguel Ángel Ruiz Macías, better known as Don Miguel Ruiz, is a Mexican author of Toltec spiritual and personal development texts..