Bruce McEwen is a pioneering expert on the ways in which the brain influences the body. He is the author of ""The End of Stress As We Know It" (with Elizabeth Norton Lasley, published by Joseph Henry Press). The book examines the response of the body to stress, what happens when the body's stress response turns against us, and how to keep that from happening. Dr. McEwen is head of the Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology at Rockefeller University in New York City.