David Pizarro is an associate professor of psychology at Cornell University. He researches moral judgment.

Mariano Sana is an associate professor of sociology at Vanderbilt University. He also works with the university’s Latin American Public Opinion Project and recently published an article about favorable public opinion toward refugees being on the rise.

Chris Zurn is a philosophy professor at University of Massachusetts Boston. He led a 2017 discussion about the ethics of antifa tactics for a series put on by the university’s Applied Ethics Center.

Zeynep Tufekci is a sociology professor at the University of North Carolina at Chapel Hill. She wrote “Twitter and Tear Gas: The Power and Fragility of Networked Protest.”

Darren Linvill is a Clemson University professor who researches disinformation on social media.

Amy Cooter, a sociology lecturer at Vanderbilt University, researches nationalism.

Mark Bray, a history lecturer at Rutgers University, is the author of “Antifa: The Anti-Fascist Handbook.”

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.