Stephan Rehfeld is an external data protection officer for many companies and data protection auditor of the DQS GmbH. Since 2000 he is Managing Director of the scope & focus Service-Gesellschaft mbH in Hanover. In addition, he is working on the ISO standards in the working group of the DIN e.V. and is working in privacy-working groups of Bitkom and the GDD. Mr. Rehfeld is mainly concerned with privacy management systems and norm-oriented implementation of data protection and the use of new business practices in data protection.