* Chairman of the Supervisory Board of KeyDrive SA <br> (Holding of Key-Systsems and NameDrive Group) <ref>[https://profiles.google.com/siffrin#siffrin/about Current positions]</ref>
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* Chairman of the Supervisory Board of KeyDrive SA <br> (Holding of Key-Systems and NameDrive Group) <ref>[https://profiles.google.com/siffrin#siffrin/about Current positions]</ref>