France, April 14 -- President Emmanuel Macron's chief of staff and closest adviser Alexis Kohler is leaving the Elysee Palace this week for a top role at banking giant Societe Generale, ending an eight-year partnership that shaped France's political landscape.

Kohler, often described as "Macron's second brain", will begin his new position as executive vice-president in June, where he will oversee mergers and acquisitions, equity capital markets and acquisition finance.

The move marks the end of an era for one of France's most powerful behind-the-scenes political figures. Since Macron's election in 2017, Kohler has served as his chief of staff throughout both presidential terms.

Their relationship began long before Macron entered the El...