This volume derives from a conference held in Frankfurt in 2014. I would like to express my heartfelt gratitude to Christian Wiese for his tremendous support in- strumental in bringing this conference to Frankfurt, including the assistance pro- vided by Grazyna Jurewicz and Ansgar Martins from the department he chairs. I am also especially grateful to Recha Allgaier-Honal, Felix Hedderich and Anna Grochocka for meticulously applying the guidelines of the style sheet to all arti- cles submitted. I wish to thank Bill Templer for translations and proof-reading services that are as always of an extremely high standard.