Dr. Matthew Rossheim (IMAGE) George Mason University Caption Dr. Matthew Rossheim's research focuses on substance use and related health outcomes. He can be reached at mrosshei@gmu.edu. Credit George Mason University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.