Dr. Morrissey focuses in the area of pediatric emergency medicine at the Massry Family Children's Emergency Center. She completed her medical education at Thomas Jefferson University Hospital in Philadelphia.

Dr. Morrissey is the Medical Director for the Sexual Assault Forensic Examiner Program, which provides support, examination, and treatment to patients in suspected cases of abuse and assault.

At Albany Medical College, she is an Associate Professor of Pediatric Emergency Medicine and the Clerkship Director of Pediatric Emergency Medicine.