Jon Alexander Krosnick (born January 5, 1959) is a professor of Political Science, Communication, and (by courtesy) Psychology, and director of the Political Psychology Research Group (PPRG) at Stanford University. Additionally, he is a Frederic O. Glover Professor in Humanities and Social Sciences and a Social Sciences Senior Fellow at Woods Institute. One major focus of his research has been questionnaire design and survey research methods. Krosnick has studied the psychology of attitudes, voter choice behavior, and attitudes toward global warming. He was also a co-principal investigator of the American National Election Study, the nation's long-running and most comprehensive academic research project exploring voter decision-making. Krosnick consults for several organizations, and has testified in court proceedings.Krosnick's work focuses on the design and methodology of questionnaires and surveys, and he has served as a consultant to the government, academia, and industry on these issues. Krosnick was a principal investigator leading the American National Election Studies from 2005 to 2009, along with Arthur Lupia of the University of Michigan. He was a member of the National Election Study Ad Hoc Committee on Survey Mode which compiled a report for the National Election Study Board of Overseers on the pros and cons of moving from face-to-face to telephone interviews. He has also studied the psychology of attitudes and researched how voters make up their minds and how campaigns influence them. He has conducted research on American attitudes toward global warming, how negativity in campaigns affects turnout, and ballot order effects. He has also been an on-television commentator on election night.