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.

Bessel van der Kolk is a Boston-based Dutch-American psychiatrist, author, researcher and educator.

Peter Attia is a Canadian-American author and former researcher known for his work in longevity medicine.

Christopher McDougall is an American author and journalist.