Director of Asset Allocation and Strategy Michele Mazzoleni departed the plan last month.
The retirement fund disclosed commitments totaling $4.5 billion in September.
The pension plan was notified of two commitments totaling $257.5 million at its Nov. 13 board of investments meeting.
The pension plan has not had consultant coverage for private equity, private debt and private infrastructure.
The new hire will assume responsibilities from Head of Americas Investor Relations Adam Caskey, who is retiring next month.
The senior investment officer has been with the plan since 2004.
The pension plan will also receive presentations from three executive search firms next month.
The pension plan recently made commitments to two existing manager relationships.
The town received three proposals in response to an investment advisor RFP issued in September.