1. Center of Evaluation, American Academy of Arts and Sciences and coordinator for the Campbell Crime and Justice Group
2. University Trustee Professor at the University of Pennsylvania Graduate School of Education and cochair of the Campbell Collaboration Steering Group
3. Center for Evaluation at the Center for Evaluation, Swedish National Board of Health and Welfare and a cochair of the Campbell Collaboration Steering Group
4. United Kingdom and reviewer for the Cochrane Collaboration
5. University of Murcia in Spain and the director of the Unit for Meta-Analysis