Scientists from Lyon

Paul Ulrich Villard (28 September 1860 – 13 January 1934) was a French chemist and physicist. He discovered gamma rays in 1900 while studying the radiation emanating from radium.

Adrien Loir (15 December 1862 – 1941) was a French bacteriologist born in Lyon. He was a nephew of Louis Pasteur, and for much of his career was associated with the Pasteur Institute.
From 1882 to 1888 Loir was an assistant in Pasteur's laboratory in Paris, where he performed research of swine fever. In 1886, he installed the first anti-rabies clinic in Saint Petersburg. Between 1888 and 1893 he made two journeys to Australia to conduct research of anthrax and pleuropneumonia. While there, he investigated the use of chicken cholera bacillus in an attempt to eradicate the country's rabbit infestation.
In 1893 he founded the Pasteur Institute of Tunisia, and for several years was a professor of hygiene and bacteriology at the colonial school in Tunis. In 1906 he traveled to Canada, where he demonstrated that the equine disease, dourine is caused by the parasite trypanosoma equiperdum.

Dr. Edmond Locard (13 December 1877 – 4 May 1966) was a French criminologist, the pioneer in forensic science who became known as the "Sherlock Holmes of France". He formulated the basic principle of forensic science: "Every contact leaves a trace". This became known as Locard's exchange principle.

Albert Jacquard (23 December 1925 – 11 September 2013) was a French geneticist, popularizer of science and essayist.He was well known for defending ideas related to science, degrowth, needy persons and the environment. He was 10 years an active member of the French communist party (PCF).

Marie Ennemond Camille Jordan (French: [ʒɔʁdɑ̃]; 5 January 1838 – 22 January 1922) was a French mathematician, known both for his foundational work in group theory and for his influential Cours d'analyse.