Jerry Melillo is Senior Scientist and Co-Director of The Ecosystems Center, Marine Biological Laboratory, at Woods Hole, Massachusetts. His research interests include a focus on the broad-scale influences of global change on terrestrial ecosystems, especially on how human activities impact the biogeochemistry of those ecosystems. His extensive research activities include soil warming experiments in Sweden and at the Harvard Forest in western Massachusetts. Dr. Melillo has served as Associate Director for Environment at the Office of Science and Technology Policy and as President of the Ecological Society of America.