NORMAN E. ROSENTHAL is the world renowned psychiatrist and bestselling author, who first described seasonal affective disorder (SAD) and pioneered the use of light therapy as treatment during his time at the National Institute of Mental Health. A prolific researcher and writer, he has written more than three- hundred scholarly articles and authored or co-authored ten popular books. These include Poetry Rx, the New York Times bestseller Transcendence and the national bestsellers The Gift of Adversity and Super Mind.