Michael Smolensky, Ph.D., is one of chronomedicine's leading authorities. Co-founder and former director of the Memorial-Hermann Chronobiology Center, he is a professor of environmental physiology at the University of Texas-Houston School of Public Health. He also is the founder and co-editor-in-chief of Chronobiology International, a journal of biological rhythm sciences.

Lynne Lamberg reports on biological rhythms, sleep, and psychiatry for the Journal of the American Medical Association, and for major magazines and newspapers. She writes a monthly online column, Books for Sleepless Nights. A resident of Baltimore, Maryland, she is the author of four other books on biological rhythms and sleep.