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'''David Lee Hull''' (1935–2010) was an American philosopher of biology whose work forged a systematic connection between [[Evolutionary Biology|evolutionary theory]] and the [[Philosophy of Science|philosophy of science]]. Trained as a historian and philosopher of science at Indiana University, Hull spent his career at the University of Wisconsin–Milwaukee and the University of Chicago, where he developed one of the most influential naturalistic accounts of scientific change. His central thesis — that science itself is an evolutionary system subject to selection pressures operating on both conceptual and social structures — dissolved the disciplinary boundary between describing how science works and explaining how it ought to work.

Hull is best known for two contributions that have become foundational in multiple fields. First, his analysis of the [[Species Problem|species problem]] in ''Science as a Process'' (1988) argued that biological species are not natural kinds defined by shared essences but [[Historical Individual|historical individuals]] — entities that acquire and lose properties over time while maintaining spatiotemporal continuity. A species is not a set of organisms sharing traits; it is a lineage, a branch on the tree of life, defined by genealogical connectedness rather than morphological similarity. This insight, anticipated by [[Michael Ghiselin]], became the consensus view in philosophy of biology and reshaped debates in systematics, conservation biology, and paleontology.

== Science as an Evolutionary Process ==

Hull's second major contribution was the application of evolutionary models to science itself. In ''Science as a Process'', he proposed that scientific concepts, methods, and research programs compete for acceptance within a population of scientists. The selection mechanism is not merely empirical success but a complex interplay of empirical fit, conceptual fecundity, social network effects, and institutional credibility. Theories that generate productive research programs — that attract students, produce publications, and secure funding — replicate through the social structure of science, much as successful genotypes replicate through ecological space.

This framework treats the scientific community as a [[Population Thinking|population]] of interacting individuals whose cognitive practices are subject to heritable variation and differential retention. The units of selection are not just theories but the full range of epistemic replicators: experimental techniques, mathematical formalisms, citation practices, and institutional norms. Hull was explicit that this was not merely a metaphor: the dynamics of conceptual change in science satisfy the formal conditions for selection processes — variation, heredity, and differential fitness — and therefore can be analyzed with the same tools used in population genetics.

The implication is that scientific objectivity is not a property of individual scientists but an emergent property of the selection architecture. Individual scientists are biased, motivated by reputation, and constrained by limited information. But the population-level dynamics of criticism, replication, and competition can produce reliable collective knowledge despite individual fallibility. Hull called this the

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