Mildred S. Seelig, M.D., MPH, is a world-renowned researcher who has studied the role of magnesium in health and disease for more than forty years. The author of numerous peer-reviewed articles and an international lecturer, she is also a master of the American College of Nutrition and a founding editor of the college's professional journal. Andrea Rosanoff, M.S., Ph.D., is an independent scholar who earned her M.S. and Ph.D. degrees in nutrition at the University of California at Berkeley. She lives in Hawaii.