Bruno Latour (French: [latuR]; born 22 June 1947) is a French philosopher, anthropologist and sociologist. He is especially known for his work in the field of science and technology studies (STS). After teaching at the Ecole des Mines de Paris (Centre de Sociologie de l'Innovation) from 1982 to 2006, he became Professor at Sciences Po Paris (2006-2017), where he was the scientific director of the Sciences Po Medialab. He retired from several university activities in 2017.

After his early career efforts, Latour shifted his research interests to focus on laboratory scientists. Latour rose in importance following the 1979 publication of Laboratory Life: the Social Construction of Scientific Facts with co-author Steve Woolgar. In the book, the authors undertake an ethnographic study of a neuroendocrinology research laboratory at the Salk Institute. This early work argued that naive descriptions of the scientific method, in which theories stand or fall on the outcome of a single experiment, are inconsistent with actual laboratory practice.  In the laboratory, Latour and Woolgar observed that a typical experiment produces only inconclusive data that is attributed to failure of the apparatus or experimental method, and that a large part of scientific training involves learning how to make the subjective decision of what data to keep and what data to throw out. Latour and Woolgar argued that, for untrained observers, the entire process resembles not an unbiased search for truth and accuracy but a mechanism for ignoring data that contradicts scientific orthodoxy.  Latour and Woolgar produced a highly heterodox and controversial picture of the sciences. Drawing on the work of Gaston Bachelard, they advance the notion that the objects of scientific study are socially constructed within the laboratory--that they cannot be attributed with an existence outside of the instruments that measure them and the minds that interpret them. They view scientific activity as a system of beliefs, oral traditions and culturally specific practices-- in short, science is reconstructed not as a procedure or as a set of principles but as a culture. Latour's 1987 book Science in Action: How to Follow Scientists and Engineers through Society is one of the key texts of the sociology of scientific knowledge in which he famously wrote his Second Principle as follows: "Scientist and engineers speak in the name of new allies that they have shaped and enrolled; representatives among other representatives, they add these unexpected resources to tip the balance of force in their favor."  Some of Latour's position and findings in this era provoked vehement rebuttals. Gross and Leavitt argue that Latour's position becomes absurd when applied to non-scientific contexts: e.g., if a group of coworkers in a windowless room were debating whether or not it were raining outside and went outdoors to discover raindrops in the air and puddles on the soil, Latour's hypothesis would assert that the rain was socially constructed. Similarly, philosopher John Searle argues that Latour's "extreme social constructivist" position is seriously flawed on several points, and furthermore has inadvertently "comical results."

What other things did he discover with his works in the laboratory?
a large part of scientific training involves learning how to make the subjective decision of what data to keep and what data to throw out.