The staff of Amsterdam University Press are shocked and saddened by the news of the death of our highly-valued author, Willem Witteveen, in the airplane crash over the Ukraine on 17 July. AUP published his De geordende wereld van het recht (2001). Moreover, for twenty years he was the editor of the Academische Boekengids. Willem Witteveen still had many ideas over future publications. He will be greatly missed.