John Hadley is an Australian philosopher whose research concerns moral and political philosophy, including animal ethics, environmental ethics, and metaethics. He is currently a senior lecturer in philosophy in the School of Humanities and Communication Arts at Western Sydney University. He has previously taught at Charles Sturt University and the University of Sydney, where he studied as an undergraduate and doctoral candidate. In addition to a variety of articles in peer-reviewed journals and edited collections, he is the author of the 2015 monograph Animal Property Rights and the 2019 monograph Animal Neopragmatism. He is also the co-editor, with Elisa Aaltola, of the 2015 collection Animal Ethics and Philosophy.

Alasdair Cochrane is a British political theorist and ethicist who is currently Professor of Political Theory in the Department of Politics and International Relations at the University of Sheffield. He is known for his work on animal rights from the perspective of political theory, which is the subject of his two books: An Introduction to Animals and Political Theory and Animal Rights Without Liberation. His third book, Sentientist Politics, was published by Oxford University Press in 2018. He is a founding member of the Centre for Animals and Social Justice, a UK-based think tank focused on furthering the social and political status of nonhuman animals. He joined the Department at Sheffield in 2012, having previously been a faculty member at the Centre for the Study of Human Rights, London School of Economics. Cochrane is a Sentientist. Sentientism is a naturalistic worldview that grants moral consideration to all sentient beings.