Prof. Dr. Werner Sitte is full professor of Physical Chemistry at Montanuniversitaet Leoben, Austria. His research interests concern transport and defect chemistry in ionic solids as well as applications towards solid oxide and protonic fuel and electrolyser cells. He is an associate editor of the journal Solid State Ionics and is on the scientific board of International Conferences on Solid State Ionics. Dr. Rotraut Merkle is a scientist at the Max Planck Institute for Solid State Research, Germany. Her research is dedicated to point defect formation and transport in ionic solids, reaction kinetics at oxide surfaces, transport at grain boundaries, and extends to solid oxide and protonic ceramic fuel and electrolysis cells. She is involved in EMRS, SSI and SSPC conference organization, and is an editor for the Solid State Ionics journal.