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 a treatment during his twenty years 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, including Poetry Rx, the New York Times bestseller Transcendence and the national bestsellers The Gift of Adversity and Super Mind.