A graduate from Ecole Polytechnique, Sylvain Géron began his career at ARCEP, the French telecom regulator, before realizing that it would be much more interesting to create a company instead. Between 1996 and 2000, 150 new telecom operators were created in France and naturally he wanted to try his luck. He jointly founded the first French ADSL operator, two years before Free, and at this time they had 10,000 clients, twice as many as Orange! In 2001, financial backers started having doubts about the future viability of ADSL, and stopped funding the industry. The company went out of business.With Marc Taieb, Sylvain started two companies: Polyconseil, providing local authorities with expertise on mobile networks, and Wifirst, which provides high-speed WiFi Internet access to clients such as universities, hotels. Both companies are now part of the Bolloré group.Between 2003 and 2005, Sylvain worked with the government minister Renaud Dutreil to draw up a law regarding business creation.In 2011, Polyconseil started to work on Bolloré group's Autolib' project.In January 2016, Sylvain become CTO of Canal+, a premium cable television network owned by Vivendi.