This page, still a work in progress, will list all those who have participated in various editions of Publishing Next. If you wish to have your details added or updated, or your profile removed, kindly contact us. Go back to directory. Add to Address Book. Mr. Klaus Willberg Managing Director/Publisher Thienemann Verlag GmbH Personal Email: klaus.willberg@web.deINTERNET Biographical Info Klaus Willberg is currently advisor to Arbeitsgemeinschaft von Jugendbuchverlagen, the association of children’s book publishers in German speaking regions, and is also a member of the Leipzig Book Fair advisory council. Klaus has been the Managing Director/Publisher of Thienemann Verlag GmbH, a publisher of books for children and young people focusing on classics, original German-language authors, and sales of licenses (book and non-book).[Read More] Categories: Uncategorized Updated 10 years ago.