John L. Horn (1928-2006).

John Leonard Horn was born in St. Joseph, Missouri, on September 7, 1928, and he died in Los Angeles, California, on August 18, 2006. John Horn was a world-renowned scholar of immense intellect, and he was highly respected in his time. I believe his major contributions to psychology, as well as his influence on psychologists, will continue to grow. His challenging factor-analytic methods of the 1960s, the important methodological debates of the 1970s and 1980s, and his continuing resistance to faddish trends in psychological research all represent fundamental contributions. Through his research and teaching he forced people to question popular assumptions and to evaluate all the data available. He challenged us to think longer, harder, and better. His work will continue to inspire important research in the fields of multivariate analysis and human cognitive abilities for many decades to come.