Author of four books and more than 100 articles and chapters, Dr. Krosnick conducts research in three primary areas: (1) attitude formation, change, and effects, (2) the psychology of political behavior, and (3) the optimal design of questionnaires used for laboratory experiments and surveys, and survey research methodology more generally.

Dr. Krosnick's attitude research has focused primarily on the notion of attitude strength, seeking to differentiate attitudes that are firmly crystallized and powerfully influential of thinking and action from attitudes that are flexible and inconsequential. Many of his studies in this area have focused on the amount of personal importance that an individual chooses to attach to an attitude. Dr. Krosnick's studies have illuminated the origins of attitude importance (e.g., material self-interest and values) and the cognitive and behavioral consequences of importance in regulating attitude impact and attitude change processes.

Among the topics explored by Dr. Krosnick's political psychology research are: how policy debates affect voters' candidate preferences, how the news media shape which national problems citizens think are most important for the nation and shape how citizens evaluate the President's job performance, how becoming very knowledgeable about and emotionally invested in a government policy issue (such as abortion or gun control) affects people's political thinking and participation, how people's political views change as they move through the life-cycle from early adulthood to old age, and how the order of candidates' names on the ballot affect voting behavior.

His questionnaire design work has illuminated the cognitive and social processes that unfold between researcher and respondent when the latter are asked to answer questions, and his on-going review of 100 years worth of scholarly research on the topic has yielded a set of guidelines for the optimal design of questionnaires to maximize reliability and validity. His recent work in survey methodology has explored the impact of mode of data collection (e.g., face-to-face, telephone, Internet) on response accuracy and the impact of survey response rates on substantive results.