{{Infobox university | image = Logotype de École normale supérieure.svg | name = École normale supérieure – PSL | other_names = Normale sup, ENS Ulm, Ulm, ENS Paris, ENS | image_size = | caption = École normale supérieure's emblem | established = | founder = National Convention | type = ENS (informal), grande école, EPSCP (administrative) | president = Pierre-Louis Lions | director = Marc Mézard | city = Paris | country = France | academic_staff = 1,400 (630 teaching fellows, 170 professors and 580 post-doctoral researchers) | students = 2,400 | undergrad = 300 | postgrad = 1,400 | doctoral = 700 | campus = Urban: 4 main sites in Paris and its suburbs (5th & 14th arrondissements, Montrouge) | budget = $130 million | free_label = | sports = | free = | colours = Purple | affiliations = | website = ens.psl.eu | footnotes = | logo = File:LOGO-PSL-nov-2017.jpg }} The École normale supérieure - PSL (; also known as ENS, Normale sup', Ulm or ENS Paris''') is a grande école university in Paris, France. It is one of the constituent members of Paris Sciences et Lettres University (PSL). Originally conceived during the French Revolution, the school was founded in 1794 to provide homogeneous training of high-school teachers in France but it later closed. The school was subsequently reestablished by Napoleon I as pensionnat normal from 1808 to 1822, before being recreated in 1826 and taking the name of École normale in 1830. When institutes for primary teachers training called écoles normales were created in 1845, the word supérieure (meaning upper) was added to form the current name. It has since developed into an institution which has become a platform for French students to pursue careers in government and academia. The ENS has a highly competitive selection process consisting of written and oral examinations. The selection rates for International Selection vary from year to year, between 5 and 10% During their studies, many ENS students hold the status of paid civil servants. The ENS is a grande école and, as such, is not part of the mainstream university system. However, the vast majority of the academic staff hosted at ENS belong to external institutions such as one of the Parisian universities, the CNRS and the EHESS. This mechanism for constant scientific turnover allows ENS to benefit from a continuous stream of researchers in all fields. ENS full