I am re-reading Ogilvy on Advertising and continually marvel at his success and insights as a marketer. There also other people from that era that were acknowledged marketing "genuiuses". Who would you say are the greatest marketing minds of our time and why? (last 20 years or so). It would be interesting to see how some of the current 'gurus' are thought of but it would also be nice to be surprised by lesser known names with significant accomplishments.