The Editor of Artificial Life would like to express his gratitude to the people listed below, who anonymously refereed papers for the journal during the preparation of this volume (Vol. 18). Their generosity, judicious judgment, and prompt response substantially helped us to publish a journal that both is timely and has exacting scientific standards. The responsibility for sustaining the quality and relevance of the journal largely rests in the hands of our reviewers. We at the journal, and all of our readers, are deeply indebted to them. It is a genuine pleasure to thank them collectively for their dedicated service. (If anyone has been inadvertently omitted anyone from this list, we sincerely apologize and ask them to let us know so that we can include their name in a future list of referees.)
Arturo Araujo
Buzz Baum
Jarle Breivik
Angelo Cangelosi
Anton Crombach
Ezequiel di Paola
Alan Dorin
Rene Doursat...