Lisa R. Fortuna, MD, is a board-certified child and adolescent psychiatrist with over fifteen years of clinical experience with children, adolescents, and families. She is currently faculty at Boston University School of Medicine and medical director of Child and Adolescent Psychiatry at Boston Medical Center. She has published highly cited articles in the areas of post-traumatic stress disorder (PTSD), adolescent substance abuse, and Latino and immigrant mental health. Fortuna received a K23 Patient Oriented Career Development Award from the National Institute on Drug Abuse (NIDA) to develop a cognitive behavioral therapy intervention for adolescents with co-occurring trauma and addictions, which formed the basis for this book. She continues to conduct research in post-traumatic stress, depression, and substance abuse, and to develop health services programs for adolescents facing these problems.