Roman Tschäppeler is a creative producer based in Biel, Switzerland, who produces documentary movies, ad campaigns and art installations. Krogerus and Tschäppeler met at school in Denmark and have written four books together - The Question Book, The Test Book, The Change Book and the international megaseller, The Decision Book, twice the bestselling UK business book of the year.

Select Guide Rating

Roman Tschäppeler is a creative producer based in Biel, Switzerland, who produces documentary movies, ad campaigns and art installations. Krogerus and Tschäppeler met at school in Denmark and have written four books together - The Question Book, The Test Book, The Change Book and the international megaseller, The Decision Book, twice the bestselling UK business book of the year.

Select Guide Rating

Roman Tschäppeler is a creative producer based in Biel, Switzerland, who produces documentary movies, ad campaigns and art installations. Krogerus and Tschäppeler met at school in Denmark and have written four books together - The Question Book, The Test Book, The Change Book and the international megaseller, The Decision Book, twice the bestselling UK business book of the year.

Select Guide Rating