The CAAT Pension Plan is parting ways with chief executive officer Derek Dobson, who has agreed to repay a controversial $1.6-million vacation payout he received last year as he ends his nearly 17-year tenure at the helm of the plan.

CAAT said in a statement on Friday that “Mr. Dobson has tendered his resignation and will leave CAAT effective immediately” as part of a settlement agreement that “brings closure to his employment at the plan.”

Mr. Dobson was placed on administrative leave last month after concerns about his leadership and the board’s oversight of his actions caused upheaval in the senior ranks of the $23-billion fund, ultimately leading to a governance crisis that has prompted an overhaul of the plan’s management.

The terms of the settlement agreement were not disclosed.

“Both Mr. Dobson and the CAAT board of trustees acknowledge the importance of moving forward in a manner that supports the long-term health of the plan and the beneficiaries it serves,” CAAT’s statement said.