In an age of multiplying devices, platforms and social media channels - it can be tempting to forget the classic lessons of marketing and branding. On a recent trip to Miami, I caught up with Bruce Turkel, an author and marketing guru who has helped some of the world’s leading brands including Hasbro, Nike, American Express and Citicorp. We chatted about the challenges of marketing in this new fluid digital environment, and why some things - like discovering the authentic truth of your brand - will never change.