Kristin Neff, Ph.D., is an Associate Professor of Educational Psychology at the University of Texas at Austin and a pioneer in self-compassion research, having conducted the first empirical studies in the field. She is the author of Self-Compassion: The Proven Power of Being Kind to Yourself (William Morrow, 2011) and co-founded the nonprofit Center for Mindful Self-Compassion (CMSC).

The American Psychological Association (APA), founded in 1892, is the leading scientific and professional organization representing psychology in the United States, with 54 divisions and more than 172,000 members. It is the publisher of the widely adopted *Publication Manual of the American Psychological Association*, now in its seventh edition (2020), which serves as the official source for APA Style and has sold millions of copies worldwide in multiple languages.

Charles Duhigg is an American journalist and non-fiction author.

Robert Greene is an American author of books on strategy, power, and seduction.

Jonathan David Haidt is an American social psychologist and author.

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