San Francisco City & County Employees' Retirement System rehired Callan as investment consultant of its $4.1 billion 457 plan.
The system issued an RFP in October due to the upcoming expiration of Callan's contract on June 30, 2021.
The system's board approved a new five-year contract for Callan beginning July 1 at its meeting Wednesday, said spokesman Stephen Worsfold.
The other finalists were Meketa Investment Group and Wilshire Associates.