Sébastien de Montessus (born 1974) is a French businessman. He was the CEO of Endeavour Mining from 2016 to 2024, until he was sacked following allegations of a multimillion-dollar "irregular payment". Montessus was born in Paris, and claims to have aristocratic ancestry. He earned a degree from

ESCP Business School ESCP Business School (; ) is a French business school and ''grande école'' founded in Paris and based across Europe with campuses in Paris, Berlin, London, Madrid, Turin, and Warsaw. Established in 1819, it is considered the world's oldest busi ...

in Paris, and started a career as an investment banker. In 2002, he joined the French nuclear power company

Areva Areva S.A. was a French multinational group specializing in nuclear power, active between 2001 and 2018. It was headquartered in Courbevoie, France. Before its 2016 corporate restructuring, Areva was majority-owned by the French state through t ...

, rising to head of mining and group deputy CEO. From 2012 to 2016, he was the CEO of La Mancha Group, and joined Endeavour Mining as CEO when La Mancha effectively gained control of Endeavour in 2015.

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{{Reflist Living people 1974 births French chief executives ESCP Business School alumni Businesspeople from Paris French bankers