Mary Ann McDonnell, A.P.R.N., B.C., is the executive director of S.T.E.P. Up 4 Kids, a nonprofit organization supporting children and teens with bipolar disorder. A clinical university instructor, she also maintains a private practice in pediatric psychopharmacology. Janet Wozniak, M.D.,isthe director of Pediatric Bipolar Research at Massachusetts General Hospital, and assistant professor of psychiatry there and at Harvard Medical School.