Katerina was Executive Creative Director and Chairman in Adel Saatchi & Saatchi (1995-2008). Under her leadership, the Agency won 326 awards. Wrote 10 books, four of them about happiness. Created the opinion site www.tsemperlidou.gr, the first Greek web site/ blog about positive thinking and happiness. For years, participated, voluntarily, as member of the Board in Greek Associations about advertising, communication and ethics in communication.