David Wechsler was an American psychologist best known for developing several intelligence tests, including the Wechsler Adult Intelligence Scale (WAIS) and the Wechsler Intelligence Scale for Children (WISC). Born on January 12, 1896, in Romania, he immigrated to the United States as a child. Wechsler's work focused on measuring different aspects of intelligence, emphasizing both verbal and non-verbal skills. Wechsler's tests have become widely used in educational and clinical settings to assess cognitive abilities. His approach to intelligence was innovative, as he believed it was not a single, fixed trait but rather a combination of various skills. His contributions have had a lasting impact on psychology and education.