William Belzak

William Belzak is a seasoned professional in the field of psychometrics, currently serving as a Senior Assessment Scientist at Duolingo, where responsibilities include the development of measurement systems to enhance proctor decision-making and AI model evaluation, along with improving rule compliance among test takers. Prior experience includes a role as an Assessment Scientist at Duolingo, where statistical methods for scoring individuals and testing for measurement bias were developed, and as a Data Science Intern at Google, focusing on human rater classification skills in advertising. William's academic background includes a PhD and MA in Quantitative Psychology from the University of North Carolina at Chapel Hill, an MA in Experimental Psychology from William & Mary, and a BA in Economics from North Carolina State University.