David H. Kingsley, PhD, is a board-certified trichologist (hair and scalp specialist) and is a world-renowned expert in treating hair-loss problems. He has frequently appeared on t...view moreDavid H. Kingsley, PhD, is a board-certified trichologist (hair and scalp specialist) and is a world-renowned expert in treating hair-loss problems. He has frequently appeared on television and radio and in newspapers and magazines. Dr. Kingsley lives with his wife, Yvonne, in Staten Island, New York.view less