Derek Parfit
contemporaryAnalytic Philosophy1942 – 2017
Derek Parfit (1942–2017) was a British moral philosopher at All Souls College, Oxford, widely regarded as one of the most significant moral philosophers of the twentieth century. His work in personal identity, population ethics, and normative theory fundamentally reshaped analytic philosophy, arguing that persons are not separately existing entities and that the separateness of persons has been overemphasized in ethical theory. In his final work, he sought to demonstrate that Kantian, contractualist, and consequentialist ethics converge on a single set of moral truths.
Notable Achievements
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Developed the Reductionist view of personal identity, arguing that persons consist in physical and psychological continuity rather than a further separately existing fact
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Introduced the Non-Identity Problem, demonstrating that acts can be wrong even when no identifiable individual is harmed by them
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Pioneered population ethics and identified the Repugnant Conclusion, exposing deep tensions in utilitarian reasoning about future persons
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Argued in 'On What Matters' (2011) that Kantian, contractualist, and consequentialist moral theories are climbing the same mountain from different sides
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