Langevin was born in Paris, and studied at the École de Physique et Chimie and the École Normale Supérieure.
He then went to the University of Cambridge and studied in the Cavendish Laboratory under  Sir J. J. Thomson.
Langevin returned to the Sorbonne and obtained his PhD from Pierre Curie in 1902.
In 1904, he became Professor of Physics at the Collège de France.
In 1926, he became director of the École de Physique et Chimie (later became École supérieure de physique et de chimie industrielles de la Ville de Paris, ESPCI ParisTech), where he had been educated.
He was elected in 1934 to the Académie des sciences.

Langevin is noted for his work on paramagnetism and diamagnetism, and devised the modern interpretation of this phenomenon in terms of spins of electrons within atoms.
His most famous work was in the use of ultrasound using Pierre Curie's piezoelectric effect.
During World War I, he began working on the use of these sounds to detect submarines through echo location.
However the war was over by the time it was operational.
During his career, Paul Langevin also spread the theory of relativity in academic circles in France and created what is now called the twin paradox.

In 1898, he married Emma Jeanne Desfosses, and together they had four children, Jean, André, Madeleine and Hélène.

In 1910, he reportedly had an affair with the then-widowed Marie Curie; some decades later, their respective grandchildren, grandson Michel Langevin and granddaughter Hélène Langevin-Joliot married each another.
He was also noted for being an outspoken opponent of Nazism, and was removed from his post by the Vichy government following the occupation of the country by Nazi Germany.
He was later restored to his position in 1944.
He died in Paris in 1946, two years after living to see the Liberation of Paris.
He is buried near several other prominent French scientists in the Panthéon in Paris.

In 1933, he had a son with physicist Eliane Montel (1898-1992), Paul-Gilbert Langevin, who became a renowned musicologist.

His daughter, Hélène Solomon-Langevin, was arrested for Resistance activity and survived several concentration camps.
She was on the same convoy of female political prisoners as Marie-Claude Vaillant-Couturier and Charlotte Delbo.
Langevin was born in Paris, and studied at the École de Physique et Chimie and the École Normale Supérieure. He then went to the University of Cambridge and studied in the Cavendish Laboratory under  Sir J. J. Thomson. Langevin returned to the Sorbonne and obtained his PhD from Pierre Curie in 1902. In 1904, he became Professor of Physics at the Collège de France. In 1926, he became director of the École de Physique et Chimie (later became École supérieure de physique et de chimie industrielles de la Ville de Paris, ESPCI ParisTech), where he had been educated. He was elected in 1934 to the Académie des sciences.
Langevin is noted for his work on paramagnetism and diamagnetism, and devised the modern interpretation of this phenomenon in terms of spins of electrons within atoms. His most famous work was in the use of ultrasound using Pierre Curie's piezoelectric effect. During World War I, he began working on the use of these sounds to detect submarines through echo location. However the war was over by the time it was operational. During his career, Paul Langevin also spread the theory of relativity in academic circles in France and created what is now called the twin paradox.
In 1898, he married Emma Jeanne Desfosses, and together they had four children, Jean, André, Madeleine and Hélène.
In 1910, he reportedly had an affair with the then-widowed Marie Curie; some decades later, their respective grandchildren, grandson Michel Langevin and granddaughter Hélène Langevin-Joliot married each another. He was also noted for being an outspoken opponent of Nazism, and was removed from his post by the Vichy government following the occupation of the country by Nazi Germany. He was later restored to his position in 1944. He died in Paris in 1946, two years after living to see the Liberation of Paris. He is buried near several other prominent French scientists in the Panthéon in Paris.
In 1933, he had a son with physicist Eliane Montel (1898-1992), Paul-Gilbert Langevin, who became a renowned musicologist. 
His daughter, Hélène Solomon-Langevin, was arrested for Resistance activity and survived several concentration camps. She was on the same convoy of female political prisoners as Marie-Claude Vaillant-Couturier and Charlotte Delbo.
Paul Langevin