Colleen conducts research addressing self-injurious and suicidal behaviors among adolescents and young adults and has published widely on these topics. Her work contributed to the inclusion of Non-suicidal Self-Injury Disorder as a new diagnosis for consideration in the Diagnostic and Statistical Manual for Mental Illness, 5th Edition. Colleen’s teaching interests include abnormal psychology, research methods, personality theories, ethics of counseling, and she developed a course devoted toward understanding and treating suicide and self-harm behaviors.