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categories: ["people", "genetics"]categories: ["people", "genetics"]tags: ["genomics", "synthetic biology", "gene editing", "de-extinction", "xenotransplantation", "sequencing"]tags: ["genomics", "synthetic biology", "gene editing", "de-extinction", "xenotransplantation", "sequencing"]summary: "American geneticist who helped invent direct genomic sequencing, founded the Personal Genome Project, and co-founded dozens of biotechnology companies."summary: "American geneticist who helped invent direct genomic sequencing, founded the Personal Genome Project, and co-founded dozens of biotechnology companies."updated: "2026-07-27"updated: "2026-10-29"issues: ["The Epstein funding, the 2019 dating-app proposal, and the dire wolf criticism are uncited."]issues: ["The Epstein funding, the 2019 dating-app proposal, and the dire wolf criticism are uncited."]------ lines 28–37 → 28–3714 unchanged lines not shown
**George Church** is an American geneticist whose laboratory at Harvard Medical School has produced**George Church** is an American geneticist whose laboratory at Harvard Medical School has producedfoundational methods in DNA sequencing, multiplexed genome engineering and genome recoding, andfoundational methods in DNA sequencing, multiplexed genome engineering and genome recoding, andwhose alumni and spin-out companies occupy much of contemporary synthetic biology. He iswhose alumni and spin-out companies occupy much of contemporary synthetic biology. He is unusualunusual among senior scientists in treating publicly provocative projects — reversing extinction,among senior scientists in treating publicly provocative projects as legitimate research programmesediting pigs for human transplant, writing data into living genomes — as legitimate researchrather than thought experiments: reversing extinction, editing pigs for human transplant, andprogrammes rather than thought experiments.writing data into living genomes. ## Career## Career lines 39–51 → 39–511 unchanged line not shown
favour of crystallography, and completed his PhD at Harvard in 1984 with Walter Gilbert. His thesisfavour of crystallography, and completed his PhD at Harvard in 1984 with Walter Gilbert. His thesiswork introduced direct genomic sequencing and multiplexed approaches that anticipated laterwork introduced direct genomic sequencing and multiplexed approaches that anticipated laterhigh-throughput methods.[^church1984] He attended the 1984 meeting in Alta, Utah, that firsthigh-throughput methods.[^church1984] He attended the 1984 meeting in Alta, Utah, that firstseriously discussed sequencing the human genome, and has been involved in genome-scale projectsseriously discussed sequencing the human genome, and has been involved in genome-scale projects everever since. He is professor of genetics at Harvard Medical School and a core faculty member of thesince. He is professor of genetics at Harvard Medical School and a core faculty member of the WyssWyss Institute.Institute. He has spoken publicly about narcolepsy and dyslexia, and has credited both with shaping how heHe has spoken publicly about narcolepsy and dyslexia and has credited both with shaping how heworks — the first by making conventional deadlines unworkable, the second by pushing him towardworks. Narcolepsy, he has said, made conventional deadlines unworkable, and dyslexia pushed himspatial and structural reasoning.toward spatial and structural reasoning. ## Key contributions## Key contributions lines 54–134 → 54–1332 unchanged lines not shown
Church's laboratory developed and commercialized methods that fed into the second generation ofChurch's laboratory developed and commercialized methods that fed into the second generation ofsequencing platforms, and its cost curve work helped drive per-genome prices down by orders ofsequencing platforms, and its cost curve work helped drive per-genome prices down by orders ofmagnitude across the 2000s. In 2005 he launched the Personal Genome Project, which askedmagnitude across the 2000s. In 2005 he launched the Personal Genome Project, which askedparticipants to publish their genomes and phenotypes under open consent rather than promisedparticipants to publish their genomes and phenotypes under open consent instead of promising themanonymity — a deliberate argument that genomic privacy in the conventional sense is not achievableanonymity. The design was a deliberate argument that genomic privacy in the conventional senseand that informed volunteers should be allowed to say so. The project's premise remains contested;cannot be achieved and that informed volunteers should be allowed to say so. The project's premisesee [[genetic-discrimination]].remains contested; see [[genetic-discrimination]]. ### Writing and rewriting genomes### Writing and rewriting genomes Multiplex automated genome engineering, published in 2009, made many simultaneous small edits to aMultiplex automated genome engineering, published in 2009, made many simultaneous small edits to abacterial genome and selected across the resulting population, treating genome engineering as abacterial genome and selected across the resulting population. It treated genome engineering as adirected-evolution problem rather than a series of single edits.[^wang2009] His group thendirected-evolution problem rather than a series of single edits.[^wang2009] His group thensystematically replaced every instance of one stop codon in *Escherichia coli*, producing ansystematically replaced every instance of one stop codon in *Escherichia coli*, producing anorganism whose genetic code differed from the natural one and which was resistant to viruses thatorganism whose genetic code differed from the natural one and which resisted viruses that depend ondepend on the standard code.[^lajoie2013] That line of work underpins [[recoded-organisms]] and thethe standard code.[^lajoie2013] That line of work underpins [[recoded-organisms]] and thebiocontainment strategies built on synthetic auxotrophy, and connects to the broaderbiocontainment strategies built on synthetic auxotrophy, and connects to the broader[[synthetic-genomes]] programme.[[synthetic-genomes]] programme. In 2013 his laboratory published one of the first demonstrations of RNA-guided editing in humanIn 2013 his laboratory published one of the first demonstrations of RNA-guided editing in humancells, appearing alongside a report from Feng Zhang's group. His lab has also encoded books andcells, alongside a report from Feng Zhang's group. His lab has also encoded books and imageimage sequences in DNA, both as a demonstration of storage density and as a test of writingsequences in DNA, both to demonstrate storage density and to test writing capacity.capacity. ### Xenotransplantation and de-extinction### Xenotransplantation and de-extinction Church's group used CRISPR to inactivate dozens of porcine endogenous retrovirus sequences in pigChurch's group used CRISPR to inactivate dozens of porcine endogenous retrovirus sequences in pigcells, and later produced live PERV-inactivated piglets — removing one of the classical objectionscells, and later produced live PERV-inactivated piglets, removing one of the classical objections toto [[xenotransplantation]].[^niu2017] The company eGenesis was founded on that work. He[[xenotransplantation]].[^niu2017] The company eGenesis was founded on that work. He co-foundedco-founded [[colossal-biosciences]] in 2021 around [[de-extinction]] programmes for the woolly[[colossal-biosciences]] in 2021 around [[de-extinction]] programmes for the woolly mammoth,mammoth, thylacine and dodo, an effort he has consistently described in terms of engineeringthylacine and dodo. He has consistently described that effort as engineering cold-tolerant Asiancold-tolerant Asian elephants rather than recreating an extinct species.elephants, not recreating an extinct species. > [!caution] What "de-extinction" delivers> [!caution] What "de-extinction" delivers> Editing a small number of trait-associated genes into a living relative produces a proxy, not a> Editing a small number of trait-associated genes into a living relative produces a proxy, not a> resurrected species. Church has said this himself; press coverage of Colossal's announcements> resurrected species. Church has said this himself, but press coverage of Colossal's announcements> frequently has not, and the 2025 dire wolf claim drew sharp criticism from paleogeneticists on> frequently has not, and the 2025 dire wolf claim drew sharp criticism from paleogeneticists on> exactly this point.> exactly this point. ### Aging### Aging Church's aging work runs through Rejuvenate Bio, which pursues combination gene therapy deliveredChurch's aging work runs through Rejuvenate Bio, which pursues combination gene therapy delivered byby [[aav-vectors]] — constructs such as [[myostatin-inhibition|follistatin]], soluble TGF-beta[[aav-vectors]], using constructs such as [[myostatin-inhibition|follistatin]], soluble TGF-betareceptor and klotho, tested in mice and dogs. He has argued that [[gene-therapy-for-aging]] is morereceptor and klotho that have been tested in mice and dogs. He has argued thattractable than small-molecule geroscience because a single delivery event can produce durable[[gene-therapy-for-aging]] is more tractable than small-molecule geroscience because a singleexpression, and that combinations matter more than any single gene. The results so far are animaldelivery event can produce durable expression, and that combinations matter more than any singleresults; no human trial has demonstrated an effect on aging.gene. The results so far are animal results; no human trial has demonstrated an effect on aging. ## Reception## Reception Church is widely regarded as one of the most generative laboratory heads in biology, measured byChurch is widely regarded as one of the most generative laboratory heads in biology, measured by themethods adopted and by former trainees running their own programmes — Kevin Esvelt'smethods others have adopted and by former trainees who now run their own programmes, among them[[gene-drive]] work and Luhan Yang's xenotransplantation company among them. He is also the mostKevin Esvelt with his [[gene-drive]] work and Luhan Yang with her xenotransplantation company. He isfrequent target of the charge that provocative announcements outrun data. A 2013 interview aboutalso the most frequent target of the charge that provocative announcements outrun data. A 2013whether a Neanderthal genome could in principle be brought to term was widely misreported as ainterview about whether a Neanderthal genome could in principle be brought to term was widelyrecruitment call for a surrogate. A 2019 proposal for a genetic-compatibility dating applicationmisreported as a recruitment call for a surrogate. A 2019 proposal for a genetic-compatibilitydrew accusations of eugenic framing, which he disputed. He accepted research funding from Jeffreydating application drew accusations of eugenic framing, which he disputed. He accepted researchEpstein and apologized publicly for the association in 2019.funding from Jeffrey Epstein and apologized publicly for the association in 2019. His scientific critics tend to make a narrower point: the distance between a demonstration in aHis scientific critics tend to make a narrower point. The distance between a demonstration in a cellcell line or a mouse and a usable human therapy is systematically longer than his public statementsline or a mouse and a usable human therapy is systematically longer than his public statementsimply, and his simultaneous roles as investigator, founder and adviser make his timelines difficultimply, they argue, and his simultaneous roles as investigator, founder and adviser make histo read as neutral estimates. Church's answer has generally been that stating an ambitious goal istimelines hard to read as neutral estimates. Church has generally answered that stating an ambitioushow funding and talent get organized, and that he separates what has been done from what isgoal is how funding and talent get organized, and that he separates what has been done from what isproposed.proposed. ## Legacy## Legacy The methods are the durable part: direct genomic sequencing, multiplexed editing, code expansion,The methods are the durable part: direct genomic sequencing, multiplexed editing, code expansion,PERV-free pigs. The companies are a second kind of legacy, and a more ambiguous one — aPERV-free pigs. The companies are a second and more ambiguous legacy. A substantial fraction of thesubstantial fraction of the commercial genome-editing sector traces to his laboratory, whichcommercial genome-editing sector traces to his laboratory, which concentrates both capability andconcentrates both capability and conflict of interest in an unusual way.conflict of interest to an unusual degree. The open question his programme poses most sharply is where recoding stops. An organism with aThe open question his programme poses most sharply is where recoding stops. An organism with acompressed genetic code is virus-resistant and biologically contained, which is attractive; the samecompressed genetic code is virus-resistant and biologically contained, which is attractive. The sametechniques applied to human cells would produce something whose relationship to the species istechniques applied to human cells would produce something whose relationship to the species isunclear, and there is currently no framework for evaluating it. Seeunclear, and there is currently no framework for evaluating it. See [[governance-of-genome-editing]][[governance-of-genome-editing]] and [[mirror-life]] for the two nearest attempts.and [[mirror-life]] for the two nearest attempts. ## See also## See also removed, struck through added, underlinedLine numbers count the serialised markdown of each revision, frontmatter included.
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