David Snyder is the executive director of the First Amendment Coalition. He comments on free speech issues.

Peter Simi is a sociology professor at Chapman University and has studied extremist groups and violence for more than two decades.

Patricia A. Turner is a professor of world arts, culture and African American studies at UCLA. She wrote the book I Heard It Through the Grapevine: Rumor in African-American Culture.

Alex Newhouse is a researcher at Middlebury College’s Center on Terrorism, Extremism and Counterterrorism, where he looks at right-wing and online extremism as well as religious fundamentalism.

The Rev. Albert Tate is co-founder and lead pastor of Fellowship Church, a multiethnic house of worship in Monrovia, California.

Jihad Turk is the president of Bayan Claremont Islamic Graduate School and a regular commentator on issues affecting the Muslim community in the United States. He previously served as director of religious affairs for the Islamic Center of Southern California, the largest mosque in Los Angeles.

The Rev. Kodo Umezu is the socho, or bishop, of the Buddhist Churches of America. He previously served as director of the Center for Buddhist Education in Berkeley, California.

Jason White is a musician, producer and vocal director who, along with rapper Kanye West, leads “Sunday Service” events in Los Angeles and across the country. Contact White through the form on his website.

The Rev. Kevin Haah is the lead pastor of New City Church of Los Angeles. He teaches courses on church planting at Fuller Seminary.