Tatjana Višak, often credited as Tatjana Visak, is a German philosopher specialising in ethics and political philosophy who is currently based in the Department of Philosophy and Business Ethics at the University of Mannheim. She is the author of the monographs Killing Happy Animals and Capacity for Welfare Across Species, and the editor, with the political theorist Robert Garner, of The Ethics of Killing Animals.

Robert Garner is a British political scientist, political theorist, and intellectual historian. He is a Professor Emeritus in the politics department at the University of Leicester, where he has worked for much of his career. Before working at Leicester, he worked at the University of Exeter and the University of Buckingham, and studied at the University of Manchester and the University of Salford.