Sam Catherine Johnston, Ed.D is a research scientist at CAST. Dr Johnston brings expertise in peer-based learning models, distance and blended education, and program evaluation. Currently, she is the CAST project director for a Bill & Melinda Gates-funded project with Creative Commons and Stanford Open Learning Initiative to integrate UDL into the design of community and technical college courses. She is also a research scientist on the U.S. Department of Education, Centre for Online Learning for Students with Disabilities and co-principal investigator for a National Science Foundation study on stereotype threat and its impact on inquiry science pedagogy.