Linda Feldman is the director of family education for the Bureau of Jewish Education of Greater Phoenix, which offers courses for interfaith couples.

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.

Ellen Davis is the senior vice president for research and strategic initiatives for the National Retail Federation, which studies spending related to winter holidays.

Dianne Ashton is a professor of religion and American studies at Rowan University in Glassboro, N.J. She is the author of Hanukkah in America: A History.

Stanley P. Rosenberg is the executive director of Scholarship & Christianity in Oxford, which supports Christian scholars and students. He also serves as an adviser to the Museum of the Bible, with a particular focus on science and the Bible.

Tom McLeish is a physics professor at Durham University. In addition to his physics research, he studies the theology of science and wrote the book Faith and Wisdom in Science.

Ross Hastings is a professor of theology at Regent College in Vancouver, British Columbia. His research interests include pastoral theology, mission spirituality and religion and science.

Andrew Harman is an associate professor of applied medical sciences at the University of Sydney. He’s also a meditation teacher at the Sydney Buddhist Centre.