Erik Meijer (M.A., Econometrics, University of Groningen; Ph.D., Social Sciences, Leiden University) is a senior economist at the University of Southern California and an adjunct economist at RAND. Much of his current research is in the economics of aging: Social Security, retirement, saving, investment, and health. Recent and ongoing work includes studying the effects of individual beliefs about stock market returns on retirement wealth, modeling the relationship between health investment, health disparities, and socio-economic disparities, and the timing of Social Security claiming during the Great Recession. He has also been one of the leading investigators of the successful RAND Continuous 2012 Presidential Election Poll. An important area of Erik's research and development is data collection, data dissemination, and data quality. He was trained in both econometrics and psychometrics, and a significant body of his research is devoted to developing the intersection of these fields, especially applying psychometric measurement models to economic problems. In addition, he has worked on a variety of other topics in economics, econometrics, psychometrics, and statistics, such as preference heterogeneity and individual choices in labor supply, housing demand, and travel demand, bias correction and variance estimation in clustered samples, sample selectivity, central bank independence, and money supply.