Richard E. Turley Jr. was a long-time historian for The Church of Jesus Christ of Latter-day Saints in Salt Lake City, Utah, and a co-author of Massacre at Mountain Meadows. He is the recipient of numerous awards, including the American Historical Association’s Herbert Feis Award and the Historic Preservation Medal from the Daughters of the American Revolution. Turley also represented relatives of the Mountain Meadows Massacre victims in their successful petition of the federal government to grant National Historic Landmark status for the atrocity site.

Turley is also the coauthor or coeditor of several works on the Mountain Meadows Massacre, including Massacre at Mountain Meadows: An American Tragedy (2008); Mountain Meadows Massacre: The Andrew Jenson and David H. Morris Collections (2009); and Mountain Meadows Massacre: Collected Legal Papers, 2 vols. (2017).

Barbara Jones Brown is the director of Signature Books Publishing and former executive director of the Mormon History Association. She also provided content editing for Massacre at Mountain Meadows. She holds an M.A. in American history from the University of Utah and a B.A. in journalism and English from Brigham Young University. While researching her genealogy after beginning work on Vengeance Is Mine, Brown discovered that, like the earlier Mountain Meadows Massacre historian, Juanita Brooks, she is a direct descendant of one of its perpetrators.