Dr Klassen is the Principal Researcher for the Human Understanding Measured Across National (HUMAN) Surveys project, which merges, formats, and harmonizes individual level data from multiple cross-national public opinion surveys. The databases combine thousands of surveys and includes millions of respondents from most countries in the world dating back decades. He uses this data to better understand historic trends and current political and social phenomena, and he was a co-authorr in a report 'Global Satisfaction with Democracy' published by the Bennett Institute for Public Policy. His main research interests investigate the causes and consequences of public satisfaction with democracy, perceptions of electoral integrity, and trust in institutions. He is open to collaborating with others who wish to use merged public opinion data to answer their own research questions.