Rory Sutherland is the Vice Chairman of one of the largest and most world reowned agencies Oglivy and Mather.
He is also the author of one of the best marketing book, Alchemy, the Dark Art and Curious Science of Creating Magic in Brands, Business, and Life.
Get his book Alchemy: https://www.amazon.com/Alchemy-Curious-Science-Creating-Business/dp/006238841X