Zuru Du, PhD, Director, Scoring and Statistical Services

Zuru conceptualizes, designs, directs and conducts statistical and psychometric research in support of ProExam products and services. Zuru earned a doctorate in Measurement, Evaluation and Statistics and a master’s degree in Applied Statistics from Columbia University. His doctoral dissertation, “Modeling conditional item dependencies with a three-parameter logistic testlet model” captured the 1999 American Educational Research Association (AERA) Division D Mary Catherine Ellwein Outstanding Dissertation Award and the 2002 American Psychological Association Division 5 Distinguished Dissertation Award.