Matthew Walker Ph.D, Author of "Why We Sleep: Unlocking the Power of Sleep and Dreams" (#17)
Adam Gazzaley M.D./Ph.D, Improving Your Brain with Medically Prescribable Video Games (#16)
Jordan Harbinger - How to Connect with People, Network, and Make Friends (#15)
Dr. Valter Longo, How to Live to 100 (#14)
Tim Urban, Wait But Why (#13)