Marc van Eck and Ellen Leenhouts are partners at Business Openers, a strategic marketing consultancy based in the Netherlands. Both have multiple years' experience of working for Procter & Gamble. Within P&G the OGSM method is widely used. As a consultant Marc has helped many organizations in The Netherlands and internationally  using this simple and effective tool. Marc also writes about Brand Positioning and Internal Branding. All his books are bestsellers in the Netherlands.