Ralf T. Kreutzer is a Professor of Marketing at the Berlin School of Economics and Law (HWR, Germany) and a marketing and management consultant. He held various leadership positions at Bertelsmann, Volkswagen, and Deutsche Post for 15 years before becoming a marketing professor in 2005. Prof. Kreutzer has significantly contributed to topics such as marketing, dialog marketing, CRM/customer retention systems, database marketing, online marketing, social media marketing, digital Darwinism, strategic and international marketing through regular publications and lectures. He has also advised numerous companies domestically and internationally in these areas.