# Peter Singer Peter Albert David Singer (b. July 6, 1946) is an **Australian-born moral philosopher**, **Ira W. DeCamp Professor of Bioethics at Princeton University** (1999-2023; emeritus since 2023), **laureate professor at the University of Melbourne**, and one of the most influential — and most controversial — living moral philosophers in the English-speaking world. Singer's 1975 book ***Animal Liberation*** is the foundational text of the modern animal rights and animal welfare movement; his 1972 essay ***Famine, Affluence, and Morality*** is the foundational argument for what became the Effective Altruism movement; and his subsequent work across bioethics, global poverty, and applied ethics has produced both an enormous academic and popular readership and a persistent controversy particularly over his positions on disability ethics, infanticide, and end-of-life decision-making that have made him a target of disability rights advocacy groups for four decades. Singer matters for the KB for three reasons. First, his 1972 essay ***Famine, Affluence, and Morality*** is the **intellectual origin of Effective Altruism** — the argument that if it is within our power to prevent something bad from happening without sacrificing anything of comparable moral importance, we ought morally to do it, and that affluent-world individuals who can prevent global poverty deaths at modest personal cost are therefore morally obligated to do so. The essay's influence runs through the entire subsequent EA movement: [[William MacAskill]], [[Toby Ord]], and the other EA movement founders consistently cite Singer's essay as the foundational argument they were attempting to operationalize. Second, ***Animal Liberation*** (1975) is one of the handful of 20th-century moral-philosophy books that materially shaped a subsequent political and cultural movement — the animal welfare agenda that has produced significant regulatory changes, corporate commitments, and the alternative-protein industry — and positioned Singer as an intellectual figure whose influence substantially exceeded the academic philosophy world. Third, his **persistent controversy over disability ethics** — particularly positions he has taken on severely disabled infants and end-of-life ethics — makes him a documentary case study in the difficulty of applying consistent utilitarian reasoning to cases that conflict with widely-held moral intuitions, and has produced decades of protest by disability rights organizations including Not Dead Yet. ## Background - Born July 6, 1946, in Melbourne, Australia; parents were Viennese Jewish refugees who fled Austria after the Anschluss (three of Singer's grandparents were killed in the Holocaust) - BA from the University of Melbourne (1967) - MA from the University of Melbourne (1969) - BPhil from the University of Oxford (1971; supervised by R.M. Hare) - Radcliffe Lecturer, University of Oxford (1971-1973) - Visiting Assistant Professor, New York University (1973-1974) - Senior Lecturer, then Professor, Monash University in Melbourne (1977-1999) - Ira W. DeCamp Professor of Bioethics, Princeton University (1999-2023) - Laureate Professor, Centre for Applied Philosophy and Public Ethics, University of Melbourne (2005-present) - Married Renata Diamond since 1968; three daughters - Co-founder, The Life You Can Save (2013) ## *Famine, Affluence, and Morality* (1972) The essay was published in *Philosophy & Public Affairs* Vol. 1, No. 3 (Spring 1972), prompted by the 1971 Bangladesh famine. The argument: - **Premise 1**: Suffering and death from lack of food, shelter, and medical care are bad - **Premise 2**: If it is in our power to prevent something bad from happening, without thereby sacrificing anything of comparable moral importance, we ought, morally, to do it - **Premise 3**: By donating to effective aid organizations, affluent individuals can prevent suffering and death at a cost that is not of comparable moral importance - **Conclusion**: Therefore, affluent individuals are morally obligated to donate substantial portions of their income to effective aid The essay produced two core corollaries that have been central to the subsequent EA movement: - **Rejection of distance as moral relevance**: The fact that dying children are geographically distant (in Bangladesh rather than in one's own city) is morally irrelevant — the obligation to help does not diminish with distance - **Rejection of the demand-limit distinction between charity and duty**: The traditional moral distinction between required charity (small amounts) and praiseworthy-but-not-required charity (larger amounts) does not hold up under the argument's premises — if you can prevent suffering at modest cost, you are obligated to do so ## *Animal Liberation* (1975) Singer's 1975 book-length treatment of animal ethics — published initially as a *New York Review of Books* essay in 1973 and then expanded into the 1975 book — is a foundational text of the modern animal welfare movement. The core argument: - **Speciesism as parallel to racism and sexism**: Discrimination on the basis of species membership alone is not morally distinguishable from discrimination on the basis of race or sex - **Moral consideration follows from capacity for suffering**: If an entity can suffer, its suffering counts morally; species membership does not determine whether an entity can suffer - **Factory farming as moral atrocity**: The scale of animal suffering produced by industrial meat production is so large that, if human suffering at comparable scale were tolerated, it would be recognized as one of the defining moral failures of the era - **Vegetarianism as practical conclusion**: The individual response to the argument is to cease consumption of animal products *Animal Liberation* has sold millions of copies, been translated into more than 20 languages, and is consistently cited as one of the most influential philosophy books of the 20th century. The modern animal rights movement — PETA, HSUS, the corporate cage-free egg campaigns, the alternative protein industry's moral positioning — substantially traces its intellectual lineage to this book. ## Applied Ethics and Bioethics Singer's subsequent work through the 1980s-2000s expanded the utilitarian framework into bioethics, producing: - ***Practical Ethics*** (1979, revised 1993 and 2011) — applied ethics textbook covering abortion, euthanasia, animal welfare, global poverty, and other topics - ***Should the Baby Live?*** (1985, with Helga Kuhse) — on severely disabled infants and end-of-life decision-making - ***Rethinking Life and Death*** (1994) — on the end-of-life and beginning-of-life ethics - ***The Life You Can Save*** (2009) — practical argument for effective giving (the book that The Life You Can Save organization is named after) - ***The Most Good You Can Do*** (2015) — explicit book-length engagement with the Effective Altruism movement ## Disability Ethics Controversy The most sustained criticism of Singer has come from the disability rights community, principally over positions he has taken regarding severely disabled infants and end-of-life ethics: - Singer has argued that in certain cases — specifically, where an infant has severe cognitive disabilities that would preclude meaningful quality of life and where parents consent — active euthanasia of the infant may be morally permissible or required - This position has been consistently rejected by disability rights organizations as equating disability with lack of worth and as legitimating historical patterns of eugenics and disability-based discrimination - Singer's 1999 appointment to Princeton was protested by Not Dead Yet and other disability rights groups; Harriet McBryde Johnson published her well-known 2003 *New York Times Magazine* essay "Unspeakable Conversations" describing her debate with Singer - Singer has consistently defended his position while acknowledging the seriousness of the disability-rights critique The controversy has been a defining element of Singer's public reception for four decades and is a standard reference point in applied ethics classrooms for cases where consistent utilitarian reasoning produces conclusions in tension with widely-held moral intuitions. ## Relationship to Effective Altruism Singer has been a significant public figure in the EA movement from its founding through the present: - **Intellectual progenitor**: The EA movement's foundational argument is Singer's 1972 essay, and he is consistently cited as the intellectual origin by [[William MacAskill]], [[Toby Ord]], [[Holden Karnofsky]], and other EA movement leaders - **Giving What We Can pledge**: Singer signed the Giving What We Can 10% pledge - **The Life You Can Save (2013)**: Singer co-founded this charity evaluator and pledge community, which functions as an EA-adjacent organization focused on global poverty - **Engagement with longtermism**: Singer has been somewhat cooler on the longtermist turn within EA (Bostrom, MacAskill's *What We Owe the Future*, the AI safety focus) than on the near-term global-poverty focus, but has not publicly broken with the movement - **2021 Berggruen Prize**: Singer received the $1 million Berggruen Prize for Philosophy and Culture, which he committed to donating substantially to Effective Altruism-aligned causes ## Connection to the KB Ecosystem - **[[Effective Altruism]]**: Intellectual progenitor of the movement via the 1972 essay. - **[[William MacAskill]] / [[Toby Ord]]**: Direct intellectual descendants and acknowledged protégés; Oxford EA movement founders who cite Singer's argument as their starting point. - **[[Holden Karnofsky]]**: Operational inheritor of the Singer framework at institutional scale. - **Animal welfare movement**: Principal intellectual progenitor of modern animal rights thought. - **Applied ethics / bioethics**: One of the defining figures of late-20th-century applied ethics. - **Utilitarianism**: Principal public exponent of preference utilitarianism (later hedonic utilitarianism); one of the dominant utilitarian voices of the period. - **Disability rights controversy**: The sustained critique from Not Dead Yet and other disability advocates is a documented case study in applied ethics controversy. ## See Also - [[William MacAskill]] - [[Toby Ord]] - [[Holden Karnofsky]] - [[Effective Altruism]] - [[Centre for Effective Altruism]] - [[Giving What We Can]]