Irwin Gotlieb, as Chairman of WPP's GroupM, oversees the largest global media budget, investing more than $100 billion annually. In 2012, Irwin was named Chairman of GroupM, moving from his previous role as CEO. Irwin joined WPP in 1999 as Chairman and CEO of Mindshare Worldwide. He is widely recognized as the "Dean" of the media industry, and in this installment of my exclusive Legends & Leaders Video Interview Series he shares insights into the past, present and future of the industry. A few examples appear below. Watch the full interview above.