Psychometricians are professionals who specialize in the field of psychometrics, which involves the measurement of psychological attributes such as intelligence, personality, and abilities. They design and analyze tests and assessments to ensure they are reliable and valid, meaning they accurately measure what they are intended to measure. These experts often work in educational settings, research institutions, or private companies, contributing to the development of standardized tests like the SAT or GRE. Their work helps in understanding human behavior and improving educational outcomes by providing insights into individual strengths and weaknesses.