David Nirenberg is a professor of history at the University of Chicago, where he specializes in medieval Christians, Jews and Muslims. Much of his work has focused on anti-Semitism.

Thomas Kaufmann is a professor of church history at the University of Göttingen in Göttingen, Germany. He is chairman of the Association for the History of the Reformation and is the author of multiple books and articles about the Reformation.

Carl R. Trueman is a professor of church history at Westminster Theological Seminary in Glenside, Pa. He teaches a course on the Reformation, which is available online, and is the author of  The Reformation: Yesterday, Today and Tomorrow. Contact via the seminary’s main telephone number or an online email form.

Lyndal Roper is a professor of history at Oriel College at Oxford University in Oxford, England. She is an expert on German religious history, especially Martin Luther and the Protestant Reformation, and the history of witchcraft. She is the author of Martin Luther: Renegade and Prophet.

Proponents of intelligent design and young-Earth creationists are going strong on the 30th anniversary of Darwin Day. How have their tactics changed and how are evolutionists adapting?

John Grim is a senior lecturer and senior research scholar at the Yale School of Forestry and Environmental Studies at Yale University in New Haven, Conn. Grim earned his doctorate in the history of religions and is a co-author of Ecology and Religion.

Shannen Dee Williams is a writer and an assistant professor of United States and African-American history at the University of Tennessee at Knoxville. She has called for Catholic theologians to remember the lives of black women in the Black Lives Matter movement.

Kenny Wiley is the director of faith formation at Prairie Unitarian Universalist Church in Parker, Colo. He graduated with a degree in political science from the University of Missouri and studied at Harvard Divinity School. Wiley has written about the need for a “Unitarian-Universalist Black Lives Matter Theology” on his blog. Contact through the church website.

Timothy Garton Ash is a British historian, author and commentator based in Oxford, U.K. He founded the project Free Speech Debate in 2011 to explore freedom of expression issues, including hate speech, from a global perspective.