John Hadley (born 27 September 1966) is an Australian philosopher whose research concerns moral and political philosophy, including animal ethics, environmental ethics, and metaethics. He spent much of his career at Western Sydney University, where he was a senior lecturer in philosophy, but also 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 (Lexington Books) and the 2019 monograph Animal Neopragmatism (Palgrave Macmillan). He is also the co-editor, with Elisa Aaltola, of the 2015 collection Animal Ethics and Philosophy (Rowman & Littlefield International). Hadley is known for his account of animal property rights theory. He proposes that wild animals be offered property rights over their territories, and that guardians be appointed to represent their interests in decision-making procedures. He suggests that this account could be justified directly, on the basis of the interests of the animals concerned, or indirectly, so that natural environments are protected. The theory has received discussion in popular and academic contexts, with critical responses from farming groups and mixed responses from moral and political theorists. Other work has included a defence of a neopragmatist approach to animal ethics, along with criticism of the metaethical and metaphilosophical assumptions of mainstream animal ethicists. Hadley has also conducted research on normative issues related to animal rights extremism, the aiding of others, and utilitarianism.
Career Hadley read for a Bachelor of Arts and doctorate in philosophy at the University of Sydney (USYD). His doctoral thesis was supervised by Caroline West, in USYD's Department of Philosophy, and was submitted in 2006 under the title of Animal Property: Reconciling Ecological Communitarianism and Species-egalitarian Liberalism. During his doctoral research, the "basic elements" of his animal property rights theory were "first assembled", leading to the publication of "Nonhuman Animal Property: Reconciling Environmentalism and Animal Rights" in the Journal of Social Philosophy. During this time, he also published in the Journal of Value Inquiry, Philosophy in the Contemporary World, and the Journal of Applied Philosophy, as well as working as a lecturer in the USYD philosophy department and a guest lecturer for the USYD Laboratory Animal Services. After his PhD, Hadley worked as a lecturer in communication ethics in the Charles Sturt University (CSU) School of Communication and a lecturer in philosophy at the CSU School of Humanities and Social Sciences. He then joined the University of Western Sydney School of Humanities and Communication Arts, first as a lecturer in philosophy, and then as a senior lecturer in philosophy. Animal Ethics and Philosophy: Questioning the Orthodoxy, a collection edited by Hadley with the Finnish philosopher Elisa Aaltola, was published in 2015 by Rowman & Littlefield International. The book aimed to move debate in animal ethics beyond developing extensionist accounts and to examine the metaphilosophical and metaethical problems with extensionist accounts. Hadley's own contribution drew attention to a perceived inconsistent triad in animal rights philosophy: the idea that moral status is determined by psychological factors (like sentience), and not species; that human and nonhuman animals are of the same kind; and that genomic plasticity offers the best explanation for change in natural selection. In the same year, Hadley published a monograph with Lexington Books entitled Animal Property Rights: A Theory of Habitat Rights for Wild Animals. The book, partially building upon his doctoral research, presents a large amount of new material on Hadley's animal property rights theory. A second monograph, Animal Neopragmatism, was published in 2019 by Palgrave Macmillan. This presented a neopragmatist approach to animal ethics. By 2026, Hadley had left Western Sydney University.
Research
Animal property rights
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