Brian Cobb is Professor Emeritus from the School of Education at Colorado State University and former Co-Chair of the Education Coordinating Group for the Campbell Collaboration, an international professional society dedicated to conducting and disseminating worldwide the results of systematic reviews (meta-analyses) of educational interventions. Brian teaches quantitative research design at the doctoral level as well as quantitative analysis particularly the statistical models used in the analysis and aggregation of experimental and quasi-experimental research studies. In recent years, Brian was P. I. of a $1.9 million U. S. Department of Education-funded, evidence-based research synthesis grant entitled What Works in Transition for Secondary Youth with Disabilities. He was also a senior researcher for a contract funded by the Rehabilitation Services Administration to conduct a national assessment of transition policies and practices. Finally he has completed work for the National Center for Special Education Research on rubrics for assessing the methodological quality and levels of evidence for interventions research in transition.