Guodong Liang, Ph.D., Senior Research Scientist, focuses on analyzing and interpreting data to help practitioners and policymakers make informed data-driven decisions. Guodong conducts research and evaluation to gauge the fidelity of implementation and impact of federally-funded programs within districts and states, district reform initiatives, and statewide educator evaluation systems. He was co-lead of CTAC’s four pivotal reviews of Maryland’s landmark teacher and principal evaluation system. Guodong’s areas of research include the relationship of professional development to teacher practice and student achievement, the implementation of statewide principal leadership development initiatives, and human capital development in charter schools. He previously served as a researcher at University of Missouri where he examined the impact of teacher quality and the opportunity gap in students’ access to qualified teachers on national achievement across 50 countries. Guodong is an Editorial Board member of Educational Researcher, one of the most distinguished journals in the field of education. He is also a certified What Works Clearinghouse (WWC) reviewer under Version 4.1 of WWC standards and procedures for group and single-case designs. His work has been published in such journals as Educational Policy, Journal of Educational Administration, Journal of Educational Research, Journal of School Leadership, and the International Journal of Educational Research.