ABOUT THE EDITORS Rodolphe Barrangou is the Todd R. Klaenhammer Distinguished Professor in the Department of Food, Bioprocessing and Nutrition Sciences at North Carolina State University; a member of the AAM, NAS, NAE, and NAI; a cofounder of Intellia Therapeutics, Locus Biosciences, Ancilia Biosciences, CRISPR Biotechnologies, and TreeCo; and Editor- in-Chief of The CRISPR Journal. Erik J. Sontheimer is the Pillar Chair in Biomedical Research and Professor in the RNA Therapeutics Institute at the University of Massachusetts Chan Medical School; an Associate Editor of RNA; a member of the AAM; a cofounder of Intellia Therapeutics; and a Scientific Advisory Board member at Tessera Therapeutics. Luciano A. Marraffini is the Kayden Family Professor and Head of the Laboratory of Bacteriology at The Rockefeller University; a Howard Hughes Medical Institute Investigator; a member of the AAM, AAAS, and NAS; and a cofounder of Intellia Therapeutics, CRISPR Biotechnologies, and Eligo Biosciences.