The new hires will permanently fill the positions that were left vacant following two resignations last year.
The plan launched the search to fill the newly created position.
The plan may hire one or more managers to handle its $1.6 billion domestic core fixed-income portfolio.
His fellow co-head will assume sole responsibility for the unit.
The U.S. business is rebranding as Agilis and is headquartered in Boston.
Departure follows those of two others at the firm earlier this month.
A Chicago plan agreed to issue an investment consultant RFP on Jan. 31.
The plan is looking to hire open-ended private infrastructure and real estate funds to replace existing mutual fund investments.
A managing director and senior consultant with investment consulting firm Verus is planning to retire at the end of 2022 after more than 35 years in the industry.
The plan is looking to invest $600 million in non-core and core real estate managers.