Shelly Lazarus, Chairman and CEO, Ogilvy & Mather Worldwide.

The ad industry isn't struggling for a new set of principles or abandoning the ones that made it great from the start. It's simply in the midst of a business cycle. I don't think it's more profound than that. And despite the economic downturn, I'm having more fun today than at any other moment in my 30-year advertising career. The game is more interesting and more relevant than ever.