Mikael Krogerus

<b>Roman Tschäppeler</b> is a consultant and creative producer with his studio guzo, based in Biel, Switzerland. <b>Mikael Krogerus </b>is an editor at Das Magazin, the cultural supplement of four of Switzerland's leading newspapers. Together, they are the authors of an internationally bestselling series of smart-thinking books, including<i> The Decision Book, The Change Book </i>and <i>The Test Book.</i>