What a pleasure to finally see this book published!

Yael Kedar and I have edited it in honour of a very special person, Jeremiah Hackett, who has given so much to scholarship and to whom I owe an huge debt of personal gratitude.

I am also grateful to all the contributors that made this volume possible. And it is a very good book indeed, in honour of a fantastic scholar whose studies have marked indelibly the understanding of medieval philosophy and science.