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

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

Sophie Gilbert is a British-born writer and journalist who works at The Atlantic in Washington, D.C., United States..

Mieshelle Nagelschneider is an American cat behaviorist, author of the eponymously titled book The Cat Whisperer and founder of The Cat Behavior Clinic in Portland, Oregon..

Dr Sandi Mann is a Senior Psychology Lecturer at the University of Central Lancashire and an experienced workplace consultant with her own private clinic. She has authored over twenty psychology books published in the UK and internationally, including Psychology: A Complete Introduction and The Psychology Bible: The Definitive Guide to the Science of the Mind.