Photo: © Eric Fecken
About the Author
Berthold Gunster is the founder of the omdenken, or flip thinking, philosophy. After studying at the Theatre Academy in Utrecht, he worked as a theatre director and writer for years. Since 2001, he and his team have been offering trainings, workshops, and shows about omdenken to companies and individuals. Berthold Gunster has written thirteen bestselling books about the omdenken theory.