Gerrit Bos (Ph.D. 1989) is Professor Emeritus of Jewish Studies at the University of Cologne. He has published extensively in the fields of Jewish studies, Islamic studies, and medieval science and medicine in Arabic and Hebrew texts. In July 2023, he celebrated his 75th birthday. On this occasion, his colleagues and students presented him with a Festschrift containing over twenty original papers. They deal with various topics belonging to his wider fields of interest ranging from the Ancient Orient, Jewish and Islamic theology and philosophy, medicine and natural sciences in medieval Islamicate and European countries, to Romance philology and linguistics.