Matthieu's expertise centers on mental health services. She is available to discuss suicide prevention, mental health in the aftermath of disasters, the mental health impact of trauma as well as the mental health of veterans. Her current research focuses on provider and organizational change required to implement suicide prevention programs for veterans and the role of social workers and other non specialty clinical providers in mental health service delivery to disaster victims.

Dr. Matthieu started working with veterans, families and communities in 1994 as a social work intern and continued full time from 1995 until 2000 as a Clinical Social Worker with the Department of Veterans Affairs, Readjustment Counseling Service's Veterans Resource Center in New Orleans, Louisiana. In 2007, Dr. Matthieu joined the faculty at the Brown School of Social Work at Washington University in St. Louis as a research assistant professor. Prior to this position, she was a National Research Service Award (NRSA) postdoctoral fellow at the Center for the Study and Prevention of Suicide at the University of Rochester. 

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