Stuart Luppescu is Chief Psychometrician at the Consortium on Chicago School Research, specializing in educational measurement. He received B.A. and M.A. degrees in Linguistics from Cornell, an M.A. in English as a Second Language from the University of Hawaii, and a Ph.D. in Educational Measurement from the University of Chicago. Before coming to Chicago, Mr. Luppescu taught English in Japan and Hawaii for 13 years. His research interests are in language acquisition, Rasch Measurement, and multi-level modeling of achievement data.