A psychometrician is an individual with expertise in the field of psychological testing. They design, administer, and interpret tests to measure various aspects of an individual's cognitive abilities, personality traits, and emotional states. Other synonyms for a psychometrician include assessment specialist, testing and measurement specialist, quantitative psychologist, psychometric expert, and evaluation consultant. These professionals work in various settings ranging from schools and universities to research institutions and corporations. They play a critical role in the assessment of individuals' intellectual abilities, personality traits, and emotional states, providing valuable insights that help improve mental health treatment, education, and organizational performance.