Benjamin D. Wright (March 30, 1926 – October 25, 2015), was a physicist and psychologist who made foundational contributions to the theory and practice of measurement. The author of this chapter was a student and later a colleague of Wright at the University of Chicago. He recounts some personal experiences of working with him and discusses how their early ideas about measurement developed. In particular they worked on the construction and measurement of constructs of the kind that are important in education and psychology, such as reading ability, creativity and fear of crime. Topics covered in this chapter include: engaging with Rasch, key measurement ideas, learning, curricula and assessments, and traditional test theory.