The Rev. Ruben Duran is the director of congregational vitality for the Evangelical Lutheran Church in America.

Maurice Samuels is a French professor at Yale University, where he also directs the Yale Program for the Study of Antisemitism.

Stosh Cotler is CEO of Bend the Arc: Jewish Action, a liberal Jewish organization that combats conservative policies. Arrange an interview through Elliot Levy.

The Rev. Paul Smith is a pastor, civil rights activist and patient advocate. He serves on the board of advisers for Compassion & Choices, which seeks to increase access to medically assisted suicide. He is the author of Facing Death: The Deep Calling to the Deep.

Conrad Hackett is Pew Research Center’s associate director of research and senior demographer. Contact him through Anna Schiller.

Daniel Cox is director of the Survey Center on American Life and a senior fellow in polling and public opinion with American Enterprise Institute. He previously served as research director for Public Religion Research Institute.

The Rev. Sangwon Doh is senior pastor of Calvary Korean United Methodist Church in East Brunswick, N.J.

Keith A. Mayes is a professor of African-American history at the University of Minnesota. He studies the significance and appeal of black holidays, including Kwanzaa.