Yi-Gang Song finished his PhD at the University of Fribourg (Department of Biology) and is now developing his research group at the Chenshan Plant Science Research Center of the Chinese Academy of Sciences in Shanghai, China. His main research interests are phylogeny, phylogeography and conservation biogeography of the genus Quercus (Fagaceae) and the genus Pterocarya (Juglandaceae). In the framework of the project Zelkova he is a tree expert and coordinator of the field work in China.