Why is Buddhism shrinking worldwide?
The global population of Buddhists shrank by roughly 5% between 2010 and 2020, the sole major religious group to decline.
Numbers, Facts and Trends Shaping Your World

Associate Director, Research/Senior Demographer
Conrad Hackett is a senior demographer and associate director of research at Pew Research Center.
He leads the Center’s demography of religion team, which studies religious change around the world. The team analyzes how religion is related to demographic characteristics. For example, they study differences in religious behavior between men and women. The team also projects the future size of religious groups. And they explore the social consequences of religion, such as how religion relates to health and happiness.
Conrad has published many articles in peer-reviewed journals, often with other researchers. Topics include secularization, Buddhist fertility, the number of Jewish Americans and the education levels of Muslim women. Other papers analyze Christian population growth in China and the evangelical population in the United States. Several of his papers focus on people who do not identify with a religion. Two of his papers won the Distinguished Article Award from the religion section of the American Sociological Association.
Conrad is president-elect of the Association for the Sociology of Religion. He has held leadership roles in six other professional groups. He has served on the editorial boards of three academic journals. Conrad earned his Ph.D. from Princeton University. His dissertation explains why Americans who are active in religious congregations tend to have more children than similar Americans who are not active in congregations.
You can follow him on social media at LinkedIn, Bluesky and X.