claim: The Beverly Hillbillies had a number of episodes that remain the most-watched.
evidence: David P. Campbell is an American psychologist who co-authored the Strong-Campbell Interest Inventory which is widely used in vocational counseling .. American. United States. psychologist. psychologist. Strong-Campbell Interest Inventory. Strong-Campbell Interest Inventory. For this accomplishment , he was awarded the E.K. Strong , Jr Gold Medal for excellence in psychological testing research , an Honorary Doctorate of Humane Letters from the University of Colorado in 1998 , and the 2001 Distinguished Professional Contributions Award from the Society for Industrial and Organizational Psychology .. University of Colorado. University of Colorado system. Society for Industrial and Organizational Psychology. Society for Industrial and Organizational Psychology. Campbell received his B.S. and M.S. degrees from Iowa State University , and his Ph.D. in psychology from the University of Minnesota , where he served as Professor of Psychology .. Iowa State University. Iowa State University. psychology. psychology. University of Minnesota. University of Minnesota. Campbell is also the author of several popular books in psychology .. psychology. psychology