A conversation with Robert Lieb, professor of supply chain management at Northeastern University's College of Business Administration, and Vince Hartnett, president of Penske Logistics. Since 1994, Lieb has conducted an annual survey of the CEOs of major third-party logistics providers. In 2007 three separate surveys were conducted covering the major geographical regions of North America, Europe and Asia-Pacific. Forty CEOs were involved in the surveys, whose companies collectively generated more than $60bn in revenue during 2006. Penske Logistics underwrote this year's research.