Alfred Marie Liénard
Alfred-Marie Liénard (Amiens 1869 - Paris 1958) is a French physicist.
Entered in 1887 with the Polytechnic school, it leaves there third in 1889 in the Corps the Mines. After a few years of service as engineer it is named in 1895 professor with the École des Mines of Saint-Etienne. Its career since then is exclusively devoted to teaching and research. It is named, in 1908, with the École des Mines of Paris from which he will become sub-manager in 1918, and director in 1929, after having occupied there during more than 20 years the pulpit of industrial Electricity.
In 1898 it publishes in the electric review Éclairage the first calculation correct of the electromagnetic field produced by a concentrated loading, animated of an absolutely unspecified movement, describing it by delayed potentials (potential of Liénard-Wiechert). It opens thus, inter alia, the way for the discovery of the Synchrotron radiation.
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