People

Elizabeth Tipton

Co-Director of the STEPP Center; IPR Fellow

tipton@northwestern.edu
Website
Twitter

Elizabeth Tipton is a Professor of Statistics and Faculty Fellow at the Institute for Policy Research at Northwestern University. She is an Associate Editor at the Journal of Educational and Behavioral Statistics and is on the Editorial Boards of Psychological Bulletin, Research Synthesis Methods, and Observational Studies. Her work has been funded by the Institute for Education Sciences, the National Science Foundation, the Spencer Foundation and the Raikes Foundation. While a member of the faculty at Teachers College, Columbia University, Elizabeth received Early Career Awards from the American Education Research Association, the Society for Research Synthesis Methods, and the American Psychological Association. She is the 2020 recipient of the Campbell Collective’s Frederick Mosteller Award for an important contribution to the theory, method, or practice of systematic reviewing. Elizabeth received a Ph.D. in Statistics from Northwestern in 2011.

Larry V. Hedges

Co-Director of the STEPP Center; IPR Fellow

l-hedges@northwestern.edu
Website

Larry V. Hedges is Board of Trustees Professor of Statistics at Northwestern University with appointments as a Faculty Fellow at the Institute for Policy Research, the School of Education & Social Policy the Department of Psychology, and the Weinberg School of Medicine. Larry is an elected member of the National Academy of Education, and a Fellow of the American Academy of Arts & Sciences, the American Statistical Association, the American Psychological Association and the American Educational Research Association. He co-founded the Society for Research on Educational Effectiveness and was honored by the establishment of the annual Hedges Lecture in 2016. Larry received the Yidan Prize for Education Research in 2018.  In 2023, he was selected by the World Cultural Council to receive the José Vasconcelos World Award for Education.  Prior to Northwestern, he was the Stella M. Rowley Distinguished Service Professor at the University of Chicago. He received a Ph.D. from Stanford University in 1980.

Lydia Bradford

Postdoctoral Fellow

lydia.bradford@northwestern.edu
Website

Lydia Bradford is a postdoctoral fellow working with Dr. Beth Tipton at the Statistics for Evidence-Based Policy and Practice (STEPP) center.  She holds a Ph.D. in Measurement and Quantitative Methods from Michigan State University where her dissertation provided a latent state-trait model for investigating mediation with multiple time points in a three-level model. Currently, she is working with Beth Tipton as part of the evaluation team to investigate the effectiveness of a culturally responsive project based learning high school science curriculum in the rural south, Culturally Responsive Crafting Engaging Science Environments (CR-CESE).

Her research focuses on statistical approaches for moderation and mediation analysis in education. Her work focuses on different hierarchical and structural equation models, as well as issues of bias and power in complex designs, based on her experience with multiple cluster randomized control trials in education.  Her research aims to improve experimental designs, explore machine learning applications for educational data, and investigate trade-offs in complex research
models.

Alonzo Lepper

Research Study Coordinator

alonzo.lepper@northwestern.edu

Alonzo Lepper is a research study coordinator collaborating with Dr. Beth Tipton at the Statistics for Evidence-Based Policy and Practice (STEPP) Center. He earned a B.A. in Psychology with a minor in Political Science from Boston University. As a first-generation Mexican-American college graduate, Alonzo is deeply passionate about leveraging computational approaches to better understand human behavior and inform evidence-based solutions.