The 15^th International Conference on the Physics of Non-Crystalline Solids is the continuation of a series of successfull meetings started by Pr. V.D. Fréchette (USA), in 1958. 13 conferences have been organized subsequently, with the latest one organized bt Pr. Cormack, from Alfred University (USA) in 2015. Continuing the tradition, PNCS XV will provide an international forum for the most recent developments on the physics of non-crystalline materials.

ESG Conference is the largest meeting organized by the European Society of Glass. The aim of this 14^th conference is to present and discuss ways to improve the quality and the performance of glass products in their various applications.

The conference will maintain the quality of the previous congresses while incorporating new features to learn about the latest developments in glass technology and European Regulations.

We are happy to organize in France these two conferences together. The two communities are both interested in glass with slightly different scientific or technologic emphases, and lot of topics can be in the 2 conferences. By organizing jointly the PNCS and ESG, we give the opportunity for the international glass community to meet in a very nice area, for scientific and technological exchanges as well as for French food specialty. We hope that you can come and enjoy these join meetings.