Charlie Lewis a Distinguished Presidential Appointee at Educational Testing Service and Professor Emeritus of Psychology and Psychometrics at Fordham University. He also taught psychology and psychometrics at Dartmouth College, the University of Illinois, and the University of Groningen. His research interests include fairness and validity in educational testing; mental test theory, including item response theory and computerized adaptive testing; Bayesian inference; generalized linear models; and behavioral decision making. He was recently co-editor and co-author of Computerized Multistage Testing: Theory and Applications (2014).

Contact Charlie via clewis@ets.org 

Michael Chajewski received his undergraduate degree in experimental psychology from the University of South Carolina, and a masters degree in forensic psychology from John Jay College of Criminal Justice, The City University of New York. He received his doctoral degree in Psychometrics and Quantitative Psychology from Fordham University. As a psychometrician, Michael worked for eight years for the College Board supporting operational testing programs such as PSAT/NMSQT and AP, as well as assisted in the redesign of the SAT. His contributions and research spanned a variety of technical work including equating, test security and system development. Since 2017 Michael has been leading the psychometrics team at Kaplan Test Prep, spearheading measurement model development for formative assessment and innovating assessment operating procedures. As an educator, Michael has taught both undergraduate and graduate courses within the CUNY system as well as at Fordham University. His research interests include configuring adaptive assessments, large data model fit evaluations, missing data impact, scaling, norming, as well as statistical software development and Bayesian statistics.

Contact Michael via michael.chajewski@kaplan.com