Millennium's corporate strategy head is leaving the $83.5 billion hedge fund

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• Alexander Campbell is departing $83.5 billion Millennium, several people said.
• The longtime head of corporate strategy joined the hedge fund more than a decade ago.
• Non-investing roles are expanding at major hedge funds like Millennium amid industry growth.

Izzy Englander's Millennium, which recently sold off a 15% stake of the firm, has just lost its head of corporate strategy.

Alexander Campbell, Millennium's head of corporate strategy since 2017...