The new executive chair has been with the firm for 22 years.
The plan liquidated its emerging markets equity fund-of-funds mandate and made $1.3 billion in total commitments in June.
Sixth Street’s new co-cio will join the firm from Goldman Sachs, where he serves as cio of its asset and wealth management unit.
The associate investment officer will report to the plan’s senior investment officer for global private credit.
The plan’s incumbent domestic large-cap growth equity manager had been on watch due to underperformance following the departure of its portfolio manager.
The fund will be accepting commitments until Jan. 31.
The fund exceeded its $400 million target and closed above its initial $500 million hard cap.
The plan had previously posted the position to the National Association of Retirement Plan Administrators website in April.
The fund will provide senior secured debt capital to middle market North American businesses.
The city will award a contract by Oct. 15.