First contact person is Dr. Hildegard Garming. She will answer your questions and connects you to the respective theses' supervisors. You can call her under 0531 596-5113 or sent her an e-mail: hildegard.garming@thuenende
The list of topics for Bachelor and Master theses is currently only available on the German website. In principal, it would be possible to conduct your thesis in English. Depending on the topic a minimum of German language skills would be an asset.