As IEEE Intelligent Systems begins its 25th year of publication, we applaud the magazine's outstanding volunteer reviewers, who have helped bring the best work in AI to these pages in 2009. Drawing on their expert knowledge, these reviewers gave careful scrutiny to each submission to the magazine, guided authors in improving their manuscripts, and selected the top articles for publication. Their hard work and exacting standards result in the consistently high quality of the peer-reviewed articles appearing in each issue. We acknowledge our reviewers here publicly and express our sincere appreciation for their generous contributions to IEEE Intelligent Systems.

— Fei-Yue Wang, Editor in Chief