Daniel Sack is a theorist and critic of contemporary performance based in the Department of English and the Commonwealth Honors College at the University of Massachusetts Amherst. He is the author of After Live: Possibility, Potentiality, and the Future of Performance (University of Michigan Press, 2015) and Samuel Beckett’s Krapp’s Last Tape (Routledge, 2016). He is the editor of Imagined Theatres: Writing for a Theoretical Stage (Routledge, 2017) and the founding editor of the accompanying web journal, www.imaginedtheatres.com. He has published more than 30 essays and reviews in a range of books, journals, and magazines, such as American Theatre, PAJ: A Journal of Performance and Art, Theater magazine, Theatre Journal, and TDR: the Drama Review.