- Albania / Albania
- Austria / Österreich
- Bosnia and Herzegovina / Босна и Херцеговина
- Bulgaria / България
- Croatia / Hrvatska
- Czech Republic & Slovakia / Česká republika & Slovensko
- Denmark / Danmark
- Finland / Suomi
- France / France
- Germany / Deutschland
- Greece / ΕΛΛΑΔΑ
- Italy / Italia
- Netherlands / Nederland
- Nordic / Nordic
- Poland / Polska
- Portugal / Portugal
- Romania & Moldova / România & Moldova
- Slovenia / Slovenija
- Serbia & Montenegro / Србија и Црна Гора
- Spain / España
- Sweden / Sverige
- Switzerland / Schweiz
- Turkey / Türkiye
- UK & Ireland / UK & Ireland
In 2009, Dr Rieger founded TEC2, which provides specialist endodontic training, in collaboration with the University of Pennsylvania, USA, and is managing director and curriculum organiser.
He has a long history of involvement in national and international training and teaching. He is author of the book Kiss, Workbook of Endodontics, and co-author of the book Endodontics Simply Successful, a case history study of endodontically treated teeth.
He is a certified member of the German Association of Dental Implantology, AIE and German Board of Oral Implantology.