Sir Martin Sorrell: Creativity has become more difficult and more interesting
WWP Group's chief executive discusses the impact of data on the business
Upward and outward for international growth
As he helps welcome Campaign to US shores, WPP Group's CEO looks at new opportunities for global operations in brand-new markets.
Comment: Ten years on, the opportunities keep on coming
Ten years ago, I accepted an invitation to chair the judging panel for Revolution magazine's first ever digital advertising awards.