Additional ongoing research initiatives at UT Dallas include researchers overseeing the long-running British Election Study (BES). Harold Clarke, the Ashbel Smith professor of political science in the School of Economic, Political and Policy Sciences, and Marianne Stewart, professor of political science are the co-principal investigators for the study, which began in 1964 and is one of the world's oldest continuous political research projects. The other two co-investigators are David Sanders and Paul Whiteley of the University of Essex in England.[140]