Meet the Management

Dr Sied Sadek DQS

Dr. Sied Sadek - Managing Director (CEO)

Dr. Sied Sadek is Managing Director (CEO) of DQS CFS GmbH and Senior Director of DQS Holding GmbH. Being an auditor for a variety of standards for over thirty years has enabled him to develop a unique understanding of the interplay of standardization, compliance and sustainable success. His main areas of expertise are organizational health, social responsibility and sustainable leadership.

behzad sadegh

Behzad Sadegh - Chief Operation Officer (COO) & Technical Director

Having been a highly accomplished auditor for more than 16 years, Behzad Sadegh is a true expert on quality and sustainability standards. As a COO and Technical Director, he manages, controls and organizes the entire operational process and all services of DQS CFS. Behzad Sadegh does not only share his expertise with clients, employees and scheme owners, but also works to ensure that DQS continues to be regarded as a true partner for sustainable success.

Dr Thijs Willaert DQS

Dr. Thijs Willaert - Director of Marketing & Communication

Facilitating the communication and interactions between DQS CFS and its stakeholders: that is the task that Dr. Thijs Willaert and his team have set themselves. The communications team is responsible for the ongoing dialogue with customers and the various channels we have established, such as our social media presence, our newsletter and the customer events.

Mariya Drechsel DQS


Mariya Drechsel has been responsible for auditor management at DQS CFS since 2018. She facilitates the application and integration of new auditors as well as the various qualification processes. She also supports the auditor team to maintain their competence through continuous training and evaluation. Since 2021, Mariya Drechsel has also been head of customer support and ensures smooth operations in this position as well.


Astrid Suding has been with DQS CFS since 2006 and took over the management of the back office in January 2021. Together with her team, she ensures that the administrative part of the audit is handled reliably and competently.