← Roy H. WilliamsPendulumby Roy H. WilliamsBusiness narrative exploring cyclical patterns of economic and organizational changeFind on Amazon↗About the authorRoy H. WilliamsRoy H. Williams is known as the Wizard of Ads and has spent decades writing about advertising, human psychology, and the secrets of effective marketing. His Wizard of Ads trilogy is required reading for small business advertisers.More by Roy H. WilliamsThe Wizard of AdsAdvertising expert reveals psychological principles underlying effective marketing→Secret Formulas of the Wizard of Ads→Magical Worlds of the Wizard of Ads→Monday Morning Memo→