Bruno Latour

Quick Facts

• Name: Bruno Latour
• Lived: 1947-2022
• Born: Beaune, France
• Died: Paris, France
• Main fields: science and technology studies, anthropology, sociology, philosophy of science
• Known for: actor-network theory, laboratory studies, nonhuman agency, the critique of modernity, ecological politics
• Major works: Laboratory Life, Science in Action, We Have Never Been Modern, Reassembling the Social, Facing Gaia

The Big Question

How do facts, machines, laws, institutions, people, and natural things hold together long enough to make a world?

In One Minute

Bruno Latour was a French thinker who changed how people study science, technology, politics, and ecology. His basic move was simple: do not start with big abstractions like "Science," "Society," or "Nature." Watch what people and things actually do together.

Latour did not think science was fake. He thought facts become real and durable through work: experiments, instruments, samples, graphs, journals, funding, habits of trust, trained bodies, and resistant things in the world. A fact is not less real because it is built. A bridge is built too. The question is whether it holds.

His best-known method is actor-network theory. It follows the humans and nonhumans that make action possible. A scientist, a pipette, a microbe, a graph, a law, and a database can all be actors if they change what happens.

What They Taught

Latour taught that modern life is made from mixed networks of humans and nonhumans. A vaccine is not only a natural object or only a social belief. It involves viruses, immune systems, laboratories, clinical trials, refrigerators, agencies, public trust, news reports, needles, and bodies. Leave out enough of the network and the vaccine does not travel.

This is why Latour studied science as practice. In Laboratory Life, written with Steve Woolgar after fieldwork at the Salk Institute, he treated a laboratory almost like an unfamiliar culture. Scientists prepared samples, ran machines, argued over traces, wrote papers, cited other papers, and turned fragile events into stable statements.

For Latour, this does not reduce science to opinion. It explains why good science is hard to defeat. A claim becomes a fact when it is tied to reliable practices and allies: instruments that keep giving the same result, samples that resist wishful thinking, papers that specialists can use, institutions that check work, and technologies that make the claim useful outside the lab. To call a fact "constructed" is not to call it imaginary. It is to ask how it was made strong.

Actor-network theory is the method for tracking this strength. Instead of saying "society explains science" or "nature explains science," Latour says to follow the associations. Who or what has to be enrolled for the result to work? What instruments translate an invisible thing into a visible mark? What papers carry that mark to other places? What machines, laws, organisms, and habits keep the claim alive?

Latour also attacked the modern split between nature and society. Modern people often talk as if facts belong to "nature" and values belong to "society." In We Have Never Been Modern, he argues that this split is more like an official story than an actual practice. The modern world constantly makes hybrids: ozone holes, climate models, power grids, patents, microbes, stock markets, satellites, and legal definitions of risk. These things are not cleanly natural or social. They are mixed through and through.

His late work turned this argument toward ecology. Climate change shows that "nature" is not a quiet background outside politics. Carbon dioxide, oceans, forests, supply chains, energy systems, elections, and lifestyles are in the same story. In Politics of Nature, Facing Gaia, and Down to Earth, Latour argues that politics has to include the nonhuman beings and systems that make collective life possible.

Key Ideas With Examples

• Actor-network theory: a method for tracing the human and nonhuman participants in an action. To understand a scientific paper, follow the authors, instruments, samples, prior studies, journals, funders, reviewers, and things being tested.
• Actor or actant: anything that makes a difference in what happens. A locked door, a speed bump, a virus, a microscope, or a legal form can be an actant because each changes the path of action.
• Nonhuman agency: the idea that nonhumans can shape events without having human intentions. A river does not "decide" like a person, but its floods can force new laws, insurance rules, maps, and building habits.
• Translation: the process by which one actor gets another actor to fit into a project. A researcher translates a sample into a number, a graph, and then an argument.
• Enrollment: the work of recruiting allies into a network. Pasteur's microbes became powerful actors when farmers, doctors, laboratories, hygiene campaigns, and state institutions entered the chain.
• Inscription: a portable mark such as a chart, table, image, number, or article. A machine turns an invisible chemical process into a line that can travel.
• Immutable mobile: something that can move without changing too much. A map, specimen label, database entry, or graph can leave its original site and still support argument.
• Black box: a result or device whose inner work is no longer inspected in everyday use. Most people use GPS without reopening the satellites, clocks, equations, code, and institutions behind it.
• Hybrid: something that crosses the supposed border between nature and society. A climate model is mathematical, political, technical, institutional, and physical at the same time.
• Modern Constitution: Latour's name for the modern habit of officially separating nature from society while quietly producing mixed hybrids everywhere.
• Matters of fact and matters of concern: a matter of fact is treated as a bare settled fact. A matter of concern shows the people, tools, risks, values, and institutions that make the fact matter.
• Gaia: Latour's name, borrowed from Earth-system debates, for an active Earth that reacts to human action. It is the unstable set of Earth systems that push back when carbon, land use, oceans, and industry change.

Major Works

• Laboratory Life (1979, with Steve Woolgar): an ethnographic study of a molecular biology laboratory. It shows how instruments, samples, notes, and arguments become facts.
• The Pasteurization of France (1984; English 1988): a study of Louis Pasteur, microbes, medicine, farms, hygiene, and state power. Pasteur's success depends on a broad network, not one lone genius.
• Science in Action (1987): a guide to studying science while it is still uncertain. Latour tells readers to follow controversies before they become textbook facts.
• We Have Never Been Modern (1991; English 1993): Latour's famous critique of the nature/society split. It argues that modernity officially separates facts from values while constantly producing hybrids that mix both.
• Politics of Nature (1999; English 2004): a proposal for ecological democracy. Scientists, citizens, and nonhuman concerns have to be assembled into public debate.
• Reassembling the Social (2005): his clearest introduction to actor-network theory. It argues that "the social" is not a hidden substance behind events but the connections that have to be traced.
• Facing Gaia (2015; English 2017): Latour's major ecological work on the "New Climatic Regime." It treats climate change as a new political and philosophical condition, not a temporary policy problem.
• Down to Earth (2017; English 2018): a short political book linking climate denial, globalization, inequality, and territory. Latour argues that politics has to return to the Earth people actually depend on.

Why It Matters

Latour matters because many problems are not just scientific, social, technical, or political. They are all of these at once. Climate change, pandemics, artificial intelligence, energy grids, public health, and environmental law are made from mixed networks.

He also gives a useful habit of attention. Instead of asking whether something is purely natural or socially constructed, ask what holds it together. What instruments make it visible? What institutions make it trusted? What nonhuman things resist or redirect human plans? What breaks when one link fails?

This changed science and technology studies. It also shaped anthropology, geography, organization studies, design theory, environmental humanities, and parts of Philosophy of Technology and AI.

Proponents, Critics, and Opponents

Latour belongs mainly to science and technology studies. He worked near Michel Callon, Madeleine Akrich, John Law, and Steve Woolgar. His work shares Thomas Kuhn's interest in scientific practice, but looks more closely at instruments, inscriptions, and material networks.

He overlaps with Michel Foucault on knowledge, institutions, and power, but Latour gives more agency to objects, machines, documents, and living things. He also reacts to the French philosophy of science after Gaston Bachelard, shifting attention from formal epistemology to everyday practices of laboratories and instruments.

Supporters value Latour because he makes hidden infrastructure visible. A fact, machine, or law is not a thing floating alone. It is a maintained arrangement. Donna Haraway is often read near him because both stress tangled human and nonhuman worlds.

Critics accused Latour of relativism. Relativism is the view that truth depends only on a standpoint, culture, or group. Some scientists and philosophers thought Latour made facts sound like victories in a social contest rather than discoveries about reality. The science wars of the 1990s made this dispute sharper.

The strongest reply is that Latour did not want weaker facts. He wanted thicker facts: facts shown with the instruments, tests, institutions, and resistant realities that support them. Still, his language can sound as if there is no difference between a well-tested scientific claim and a persuasive belief. His later essay "Why Has Critique Run Out of Steam?" admits the danger and argues that criticism should protect reliable knowledge, not arm climate denial or conspiracy thinking.

Some political critics also argue that actor-network theory can flatten power. If every actor is one node in a network, capitalism, colonialism, race, class, and state violence can look less structurally forceful than they are. Latour's defenders answer that careful network description can show power in detail, but the worry remains a real tension.

Related Pages

• Thomas Kuhn
• Gaston Bachelard
• Michel Foucault
• Donna Haraway
• Alfred North Whitehead
• Philosophy of Science
• Philosophy of Technology and AI
• Critical Theory